VST3 plugins keep getting blacklisted.

I've successfully (allegedly) compiled qtractor with VST3. When i create a midi track, and attempt to add a VST3 instrument plugin, the rescan flashes briefly, and then nothing. If i attempt to rescan again, the same thing happens. When I check the blacklist, all the vst3 plugins are there.

On the first attempt to add a VST3 plugin after compiling, 2 appeared, then on the next rescan, 3 different plugins appeared, then nothing from there, as i wrote above.

I have Diva installed as well as others, and that got blacklisted as well.

I opened Qtractor in a terminal, and no messages appeared at all indicating some sort of scan failure.

I'm using the latest build from git. (0.9.27 dirty)

I followed the VST instructions, and during compile the build data indicated VST3 was recognized.

Any clues?

Alex.

Edit: In the message box at the bottom of the window, i've got this message: QProcess: Destroyed while process ("/usr/lib/qtractor/qtractor_plugin_scan") is still running.