Hey Lukas, what would cause this issue to happen to the entirety of MAC users though? I'm the commissioner of the league these members are having issues with, and it's about a half dozen GMs who have the problem. No PC user has an issue, and no MAC user has an issue with another league they're in.
Note that it is possible to get the file downloaded from outside of the game, but it's a clunky process that diminishes the experience for GMs. As a short term fix it can be worked around, but if this is a problem going forward, GMs have threatened to drop my league