Wow. This turned out to be the same bug that I found in IK Amplitube over two years ago:
http://www.zynewave.com/forum/viewtopic.php?t=1406
It’s likely that the new plugins use some of the code that is also found in Amplitube. It appears to me that this would be a very simple bug to fix.
If you search for Amplitube on this forum you’ll see that I and other users have failed to get a reply from IK about this.
Since it seems unlikely that IK will fix this soon, I’ve modified Podiums code so that the standard “all notes off” and “all sound off” MIDI messages are only sent to VST instruments and not effects. Fingers crossed that this will not cause other plugins to suffer from hanging notes. Hopefully the IK synths will not crash if they receive “all notes off” messages 🙄
Now all the tracks are active in that arrangement and I can´t even get it to open anymore.
You can disable the “activate power when opening arrangement editor” in the Preferences. That will allow you to open and edit the arrangement without loading the crashing plugin.