I have actually had this problem since a few versions ago. Basically many of my earlier projects were using some VSTs that I can only assume came from Fruity Loops. I got used to a particular “free filter” and used it in many years worth of projects. I remember having no problem with them with version 2.1 and maybe a bit later.
But now and for a while I have been getting some major errors, with Renoise showing a window telling me that they can destroy my song. Any reason why earlier versions were compatible with this VST and not anymore?
I didn’t bother upload a project with it, because it happens with all of them!