It's possible we're both seeing different issues in that case. I also just realised I can create #Test but not Test# (unless I switch to MLST mode, where both work).
Reproducing what you're seeing may require connecting to the same (type of) FTP server that you're using.
Would you be able to send any details about the FTP server to GPSoftware Support? That's also the place to get an ETA.
The Test# folder appears as Test for me as well, until I switch to MLST mode.
Folders called #Test work fine, however.
When you checked MLST mode, was that for the actual site entry, not for the Default Settings entry at the top? The site entry may override the defaults so it's the one to check.