COPY and this won't help you but

I just went into BIAB and RB (each with latest updates) and tested both a 64-bit ONLY VSTi and a 64-bit ONLY VST and each opened and worked and JBridge version 1.74 "bridged" without issue.

Best I can offer is make sure you are running as Administrator; reinstall BIAB and RB (it only takes a few minutes) double check in RB that options defaults aren't some weird setting; reinstall JBridge

then CALL PG - or maybe just call them FIRST anyway

GOOD LUCK!
Larry


Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20