ZUMO XT / MAC 11.0 / BASECAMP CRASHES

I have a Garmin Zumo XT and every time I connect to Mac 11.0 Basecamp crashes. Installed Garmin Express and it sees device but basecamp won't.  Uninstalled Garmin Express and same result. Am using Basecamp version 4.8.11 and Zumo XT software is up to date. Pretty expensive device to throw in the lake but I'm about there. Please help

Thanks,

Mark