It's does take a long time working it all out, it still has issues that need fixing but Adar needs to wait on the Delphi programmers to get time to modify BBW4.
If sections don't show it could be the reapeaks that are missing, there is an action "Peaks: Build any missing peaks"
there is also a script to batch create all the reapeaks so tracks load instantly.
If tracks say mono but come in as stereo that means the actual source is stereo.
If you have too many issues you have the Import SGU script for Reaper.