I thought I posted this yesterday, but don't see it in the forum. On forte 4.5.4 (build 54), I'm once again having a problem with VSTi's being greyed out in the menu when trying to add them via +INST. This happened back in this thread on the old forum as well. Thanks for looking into this, let me know if I can do some testing to help.
In case anyone else has this issue, the problem is due to having too many VSTs in the directory that forte scans in the Plugin Manager. I had my 64-bit version of forte scanning both the 64-bit directory, and also the 32-bit vst directory (for those plugs I use via jbridge). Between the two directories and over the years, I had more than 1,000 dll files in there, and that was causing the problem. Once I cleared out some of the old junk, everything worked. Keep in mind that while 1,000 seems like a lot, Waves alone is some 400+. 800+ when you include both directories. That is, if you used shell2vst to convert your waveshell.dlll file to individual vsts. So if you see greyed-out entries when you go to add a new VST, it may be too many dlls in the vst folder(s) that forte scans. Thanks for the help, Mike!