If I change the VST plugin folder for one version, it changes it in the other version too.
Are you running an old version of Bidule? You should be able to have different VST folders for 32 and 64bit, the 64bit version will use the vst path of the 32bit version if there is none set for the 64bit one.
Adjusting "floating frames" makes no difference.
floating frames will only be enabled the next time a window is created, "closing" a window hides it, double-clicking on a bidule will show it again without recreating it from scratch (I'm simply stating this in case it explains "makes no difference".