I'm seeing lots of compendium access problems with both Mongoose and 5E. However downdetector noted a large number of reported roll20 outages this AM, and a trickle now, so it could be either the Internet or roll20 broke something. It's (apparently) not specific to Traveller. I did notify the maintainer of the Traveller compendium (Coryphon) about what I saw, just in case. But you might want to PM him with your issue.