Another issue I discovered is if a VST host (e.g. Image Line MiniHost) saves a TBridge multi-VST preset as part of its own project format, only the first configured VST in the TBridge/NetVST preset will work when the project is later loaded back into the VST host. To get the the VSTs that were registered after the first one to continue passing through the MIDI note messages, I have to first de-register them from and then re-register them again with TBridge.
In case anyone is interested, I am attaching a PDF of the user guide for TBridge (in English):
