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rncbc's picture

exactly.

you have to install the Qt5 build of the QmidiArp LV2 plugins for the GUI to show and run under Qtractor (Qt5 build);
or vice-versa, you need to install and run a Qt4 build of Qtractor to let Qt4 plugin GUIs to be any usable.

though, I'd recommend the former, as Qt4 is coming to a deprecating phased-out stage any day sooner or later.

hth.
cheers