flstudio 12 to fl 20 because I don't remember this ever happening before that. I just ignored the issue since all important vsts had a 64 bit counterpart. But since Genesis Pro was just released as a 32 bit only ...
FLStudio 12.5.1 in which all the mixer channels have the mix buss or channel buss via "Virtual Mix Rack" vst from Slate Digital. But when I have saved it and reopened it, no plugin was found, except ...