Has anyone tried using Birdseye on an OR or DK with a semi-transparent map? It seems that BaseCamp ignores the Transparent=S option and it has something to do with Birdseye.
See:
https://forums.garmin.com/showthread.php?t=8404
If the problem is restricted to BaseCamp, it should be easy to live with. If it also applies on the GPSr, then cpreview won't work and it might be a reason to revert to a really old cgpsmapper compiler of the sort that accepts (IIRC) the "pvx" switch.