PG, FabFilter says this is because these two VST2 plugins (Pro-Q2 and Pro-MB) have side-chain, and Wavelab isn’t connecting to the sc inputs when using them as ciip plugins. They say Steinberg should fix it, but you say they should fix it because it’s side-chain in a VST2 plugin and side-chain is not supported in VST2.4, so it’s up to them to fix if they’re going to use an unsupported function in a VST2 plugin? Is that correct?
The fix is just to use the VST3 versions of the plugins, but I guess this VST2 use would be for legacy project recall, so the VST2 crash should probably be fixed by someone?
EDIT: according to FabFilter, sidechain is supported in VST2.4. Sorry for saying otherwise.