Can't save session anymore

[sonik]

I installed manjaro (arch) on my studiocomputer, because my tangostudio was really getting too old. The problem is that some (not all) of my old sessions can't be saved anymore. Mixbus crashes with a core dump error. Most of the sessions, which can't be saved, complain about a plugin not being found. They open, i can delete the plugin, but i can't save. It's probably not a permission problem, as other sessions on the same disk and in the same folder save correctly.

[sonik]

Found the culprit; IR-LV2 Reverb.
For this i need to start Mixbus in a terminal with the -d option (deactivate plugins), then delete the plugin in the project, save and add again the plugin.