Guild of Writers

So, on my Mac:
11" Macbook Air, 4GB RAM, 120GB SSD, Mac OS 10.7.3
I can successfully log into the Gehn Shard, however after login, all I see is a blank screen. It's an empty black window that says Uru - Gehn Shard.
The only thing that happened between when it worked and didn't is that it updated itself, however I hadn't logged in for a long time anyway, so that isn't necessarily the cause.

Have you updated the data files from MOULa 905?

Assuming you’re using WineSkin, this sounds like the issue mentioned by gabriml in the Installing Gehn Shard on OSX thread and reportedly fixed by turning off “Decorate Windows”.