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bbfa235
(Get the code!)
The play-button flickering thing is a good hint!
Could you check that you have no MIDI devices enabled?
Open the preferences and expand the "MIDI Controllers" tree item. If you see ANY MIDI controllers listed (including default devices like "MIDI Through Port") select the device and make sure the 'Enabled' checkbox is unchecked. Additionally, for MIDI Through Port, hit "Clear All" to clear all mapped controls for it.
I get almost identical results to what you are describing when I load the Vestax Typhoon mapping to my MIDI Through Port and enable the device. The play button flickers like crazy and the output is static.