Gah. I did fresh installs of all the Garmin software and restarted. Same issues. The MapManager says it was installed successfully, but it's on my hard drive and doesn't show up in BaseCamp. MapInstall still says "No unlocked maps were found for this device". I tried another map and got the same result.
BTW, a map I bought from Garmin is on my 30x and I've had no issues.
BTW, a map I bought from Garmin is on my 30x and I've had no issues.