Hi, it freezes to me too. Here's the output from the terminal: marius@marius-desktop:~$ mixxx Debug: [Main]: Mixxx 1.8.2 "" is starting... Debug: [Main]: Qt version is: 4.7.0 Debug: [Main]: Configuration file is at the current version 1.8.2 Debug: [Main]: Setting "[Channel1]" "play" as toggle Debug: [Main]: Setting "[Channel1]" "wheel_touch_switch" as toggle Debug: [Main]: CachingReader using 4980736 bytes. Debug: [Main]: Setting "[Channel2]" "play" as toggle Debug: [Main]: Setting "[Channel2]" "wheel_touch_switch" as toggle Debug: [Main]: CachingReader using 4980736 bytes. Debug: [Main]: ControlObject::getControl returning NULL for ( "[Mixer Profile]" , "LoEQFrequency" ) Debug: [Main]: Setting "[Channel1]" "filterLowKill" as toggle Debug: [Main]: Setting "[Channel1]" "filterMidKill" as toggle Debug: [Main]: Setting "[Channel1]" "filterHighKill" as toggle Debug: [Main]: Setting "[Channel1]" "pfl" as toggle Debug: [Main]: Setting "[Channel2]" "filterLowKill" as toggle Debug: [Main]: Setting "[Channel2]" "filterMidKill" as toggle Debug: [Main]: Setting "[Channel2]" "filterHighKill" as toggle Debug: [Main]: Setting "[Channel2]" "pfl" as toggle Debug: [Main]: Setting "[Channel1]" "flanger" as toggle Debug: [Main]: Setting "[Channel2]" "flanger" as toggle Debug: [Main]: SampleRate 48000 Debug: [Main]: Latency 21 bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) bt_audio_service_open: connect() failed: Connection refused (111) Debug: [Main]: ("QSQLITE", "QMYSQL3", "QMYSQL") Debug: [Main]: src/library/trackcollection.cpp DB status: true Debug: [Main]: QSqlError(-1, "", "") Debug: [Main]: SchemaManager::upgradeToSchemaVersion already at version 5 Debug: [Main]: TrackDAO::initialize QThread(0x8d4cef8, name = "Main") "qt_sql_default_connection" Debug: [Main]: CrateDAO::initialize() Debug: [Main]: CueDAO::initialize QThread(0x8d4cef8, name = "Main") "qt_sql_default_connection" Debug: [Main]: Created MissingTracksModel! Debug: [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html" Debug: [Main]: ITunesLibrary=[ "/home/marius/.itunes.xml" ] Warning: [Main]: WPushButton for control "[Channel1],loop_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],loop_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel1],TrackEndMode" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],TrackEndMode" is null, skipping. Warning: [Main]: WPushButton for control "[Channel1],hotcue_1_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel1],hotcue_2_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel1],hotcue_3_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel1],hotcue_4_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],hotcue_1_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],hotcue_2_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],hotcue_3_enabled" is null, skipping. Warning: [Main]: WPushButton for control "[Channel2],hotcue_4_enabled" is null, skipping. Debug: [Main]: createWaveformViewer() Debug: [Main]: WaveformViewerFactory :: Creating new visual waveform Debug: [Main]: WaveformViewerFactory :: Making new GL context. Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#0000ff" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#00ff00" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#0000ff" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#0000ff" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#0000ff" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: createWaveformViewer() Debug: [Main]: WaveformViewerFactory :: Creating new visual waveform Debug: [Main]: WaveformViewerFactory :: Sharing existing GL context. Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#ff0000" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#00ff00" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#ff0000" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#ff0000" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: Didn't get mark Color, using parent's MarkerColor: "#ff0000" Debug: [Main]: Didn't get mark TextColor, using parent's BgColor: "#ffffff" Debug: [Main]: WARNING: Text widgets not destroyed before rebooting GUI. Debug: [Main]: WARNING: BPM widget pointers wre not reset on GUI reboot. Debug: [Main]: WARNING: Number widgets were not reset before rebooting GUI. Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel1]" , "hotcue_33_position" ) Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel2]" , "hotcue_33_position" ) Debug: [Main]: PlaylistTableModel::setPlaylist 1 Debug: [Main]: WTrackTableView::loadTrackModel() PlaylistTableModel(0x981daf8) Debug: [Main]: WTrackTableView::loadTrackModel() PrepareLibraryTableModel(0x98d9ac8) Debug: [Main]: MixxxLibraryFeature::activate() Debug: [Main]: WTrackTableView::loadTrackModel() LibraryTableModel(0x8f0f818) Debug: [Main]: WLibrary::switchToView "WTrackTableView" Debug: [Main]: Constructed LibraryScanner!!! Debug: [Main]: iTunes Album Art path is: "" Debug: [LibraryScanner 1]: LibraryHashDAO::initialize LibraryScanner(0x8fd0c60, name = "LibraryScanner 1") "LIBRARY_SCANNER" Debug: [LibraryScanner 1]: CueDAO::initialize LibraryScanner(0x8fd0c60, name = "LibraryScanner 1") "LIBRARY_SCANNER" Debug: [LibraryScanner 1]: TrackDAO::initialize LibraryScanner(0x8fd0c60, name = "LibraryScanner 1") "LIBRARY_SCANNER" Debug: [LibraryScanner 1]: Legacy importer took 0 ms Debug: [Main]: Could not read "/home/marius/.mixxx/midi/MixxxMIDIDevices" Debug: [Main]: Scanning MIDI devices: Debug: [Main]: Found output device # 0 Midi Through Port-0 Debug: [Main]: Found output device # 2 CA0106 MPU-401 (UART) Debug: [Main]: Found input device # 1 Midi Through Port-0 Debug: [Main]: Linking to output device # 0 "Midi Through Port-0" Debug: [Main]: Starting script engine with output device "" Debug: [MidiScriptEngine 1]: MIDI Device in script engine is: "" Debug: [Main]: Found input device # 3 CA0106 MPU-401 (UART) Debug: [Main]: Linking to output device # 2 "CA0106 MPU-401 (UART)" Debug: [Main]: Starting script engine with output device "" Debug: [MidiScriptEngine 2]: MIDI Device in script engine is: "" Debug: [Main]: MidiDeviceManager::getDeviceList Debug: [Main]: MidiDeviceManager: Setting up devices Debug: [Main]: PortMIDI device "1. Midi Through Port-0" already closed Debug: [Main]: MidiMapping: Loading MIDI preset from "/home/marius/.mixxx/midi/Midi_Through_Port-0.midi.xml" Debug: [Main]: MidiOutputMappingTableModel::removeRows() Debug: [Main]: "Midi Through Port-0" settings found Debug: [MidiScriptEngine 1]: MidiScriptEngine: Loading & evaluating all MIDI script code Debug: [MidiScriptEngine 1]: MidiScriptEngine: Loading "/usr/share/mixxx/midi/midi-mappings-scripts.js" Debug: [Main]: MidiMapping: Input parsed! Debug: [Main]: MidiMapping: Output parsed! Debug: [Main]: PortMIDI device "3. CA0106 MPU-401 (UART)" already closed Debug: [Main]: MidiMapping: Loading MIDI preset from "/home/marius/.mixxx/midi/CA0106_MPU-401_(UART).midi.xml" Debug: [Main]: MidiOutputMappingTableModel::removeRows() Debug: [Main]: "CA0106 MPU-401 (UART)" settings found Debug: [MidiScriptEngine 2]: MidiScriptEngine: Loading & evaluating all MIDI script code Debug: [MidiScriptEngine 2]: MidiScriptEngine: Loading "/usr/share/mixxx/midi/midi-mappings-scripts.js" Debug: [Main]: MidiMapping: Input parsed! Debug: [Main]: MidiMapping: Output parsed! Debug: [Main]: selectedAPI is: "ALSA" Debug: [Main]: getSliderLatencyMsec in: 10 Debug: [Main]: getSliderLatencyMsec out: 21 Debug: [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html" Debug: [LibraryScanner 1]: Recursively scanning library. Debug: [Main]: loadSettings: 1 0 "" Debug: [Main]: slotApply crossfader: 1 "" Debug: [Main]: BpmSchemes::readXML "/home/marius/.mixxx/mixxxbpmscheme.xml" Debug: [Main]: MidiDeviceManager::getDeviceList Debug: [LibraryScanner 1]: Recursive scan finished cleanly. Debug: [LibraryScanner 1]: Writing tracks to database by TrackDAO::addTracks() took 1 ms Debug: [LibraryScanner 1]: Marking unverified tracks as deleted. Debug: [LibraryScanner 1]: Marking unverified directories as deleted. Debug: [LibraryScanner 1]: Detecting moved files. Debug: [LibraryScanner 1]: Scan finished cleanly Debug: [LibraryScanner 1]: Scan took: 241 ms Debug: [Main]: MidiDeviceManager::getDeviceList Debug: [Main]: MidiDeviceManager::getDeviceList Debug: [Main]: SoundManager::setupDevices() Debug: [Main]: Building timecode lookup tables... Allocating 2097152 slots (8192Kb) for 20 bit timecode (Serato 2nd Ed., side A) Debug: [Main]: Starting vinyl control xwax thread Debug: [Main]: Building timecode lookup tables... Allocating 2097152 slots (8192Kb) for 20 bit timecode (Serato 2nd Ed., side A) Debug: [Main]: Starting vinyl control xwax thread Debug: [Main]: SoundDevicePortAudio::open() "0, CA0106: CA0106 (hw:0,0)" Debug: [Main]: m_dSampleRate 48000 Debug: [Main]: iLatencyMSec: 21 Debug: [Main]: output channels: 2 | input channels: 0 Debug: [Main]: iFramesPerBuffer 1024 Debug: [Main]: iLatencyMSec: 21 Debug: [Main]: Opening stream with id 0 Expression 'parameters->channelCount <= maxChans' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 916 Expression 'ValidateParameters( outputParameters, hostApi, StreamDirection_Out )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2085 Debug: [Main]: Error opening stream: Invalid number of channels I'm using a ATI HD 4650 with fglrx. I tried to install the latest drivers but without result..