re. shortcuts which throw an error in the Messages pane
i'm afraid there's not much we can do about that--the warning message is emitted by Qt framework itself to stderr which in this case falls outside of application programming control. the cases where it might happen are often the ones you set a keyboard shortcut on the MIDI clip editor that is already assigned to the main application window already, especially on the main Transport menu commands.
oops. sorry for the little inconveniences :) probable fix is under way to git head master aka qtractor v0.7.2.8+
http://sourceforge.net/p/qtractor/code/ci/9a3c4c
https://github.com/rncbc/qtractor/commit/9a3c4c5
re. shortcuts which throw an error in the Messages pane
i'm afraid there's not much we can do about that--the warning message is emitted by Qt framework itself to stderr which in this case falls outside of application programming control. the cases where it might happen are often the ones you set a keyboard shortcut on the MIDI clip editor that is already assigned to the main application window already, especially on the main Transport menu commands.
hth.
cheers