This bug also affects me! (I created this account just now to comment here.) The screenshot Tom posted looks very much like what is happening with me. I ran the player with the --debug flag. Here is what was written to standard error: ---------------------------------------------------------------------------STD ERR----------------------------------------------------------------------------------------- [PIPELIGHT:LIN:unknown] attached to process. [PIPELIGHT:LIN:unknown] checking environment variable PIPELIGHT_SILVERLIGHT5_1_CONFIG. [PIPELIGHT:LIN:unknown] searching for config file pipelight-silverlight5.1. [PIPELIGHT:LIN:unknown] trying to load config file from '/home/alex/.config/pipelight-silverlight5.1'. [PIPELIGHT:LIN:unknown] trying to load config file from '/etc/pipelight-silverlight5.1'. [PIPELIGHT:LIN:unknown] trying to load config file from '/usr/share/pipelight/configs/pipelight-silverlight5.1'. [PIPELIGHT:LIN:unknown] sandbox not found or not installed! [PIPELIGHT:LIN:silverlight5.1] GPU driver check - Your driver is supported, hardware acceleration enabled. [PIPELIGHT:LIN:silverlight5.1] using wine prefix directory /home/alex/.wine-pipelight. [PIPELIGHT:LIN:silverlight5.1] checking plugin installation - this might take some time. wine: cannot find L"C:\\windows\\system32\\winemenubuilder.exe" err:wineboot:ProcessRunKeys Error running cmd L"C:\\windows\\system32\\winemenubuilder.exe -a -r" (2) [PIPELIGHT:WIN:silverlight5.1] embedded mode is on. [PIPELIGHT:WIN:silverlight5.1] windowless mode is off. [PIPELIGHT:WIN:silverlight5.1] linux windowless mode is off. [PIPELIGHT:WIN:silverlight5.1] force SetWindow is off. [PIPELIGHT:WIN:silverlight5.1] unity hacks is off. [PIPELIGHT:WIN:silverlight5.1] window class hook is on. [PIPELIGHT:WIN:silverlight5.1] replaced API function CreateWindowExA. [PIPELIGHT:WIN:silverlight5.1] replaced API function CreateWindowExW. [PIPELIGHT:WIN:silverlight5.1] replaced API function TrackPopupMenuEx. [PIPELIGHT:WIN:silverlight5.1] replaced API function TrackPopupMenu. fixme:advapi:RegisterTraceGuidsW (0x2b22a7, 0x350120, {aa087e0e-0b35-4e28-8f3a-440c3f51eef1}, 1, 0x68f6a8, (null), (null), 0x350120): stub [PIPELIGHT:WIN:silverlight5.1] init successful! [PIPELIGHT:LIN:silverlight5.1] using thread asynccall event handling. java version "1.7.0_51" OpenJDK Runtime Environment (IcedTea 2.4.6) (7u51-2.4.6-1ubuntu4) OpenJDK Server VM (build 24.51-b03, mixed mode) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- It should be noted that I installed Pipelight prior to this for Netflix purposes; not sure how it affects this program. I also saved what was written to standard out, just in case: -----------------------------------------------------------------------STD OUT--------------------------------------------------------------------------------------------- Nuvola Info nuvolaplayer.vala:142: Welcome to Nuvola Player, version: 2.3.2 Nuvola Info nuvolaplayer.vala:146: Revision: 807,