Win7 x64, Gilded Hallow Guild Hall.
Enter, walk over to the War Room Proprietor in the tavern, select “what’s required to build a war room”, also open the guild panel while that’s open, the game will shortly crash with one of several errors – I’ve seen an OOM and an access violation from a pointer deref to 0×00000008.
If it seems to work fine, click any of the tab options in the guild panel, and it will load them and immediately die – so badly that the “GW2 crashed” dialog will close within 5 seconds.
I submitted a crash report for the first (access violation), but the OOM: Heap error results in the crash report dialog closing before it sends successfully.