We've just updated the beta to 2.7.1 with some minor fixes based on feedback. In particular, we fixed an issue where the Mac 9.x and below version would fail to load entirely. We also fixed an issue with downloads, fixed an error with the files in the library, and made several other minor changes.

We have not addressed the problems seen by Mark, as we have not fully diagnosed the issue at this time.

Thanks for everyone's help!