Running Windows 7 RC 7100 x64 with ATI Radeon 4850 video and 9.8 Catalyst drivers.
I've encountered this problem since the start on the WB 7 betas: when I use "Move To Folder" from the message ribbon-bar, the resulting dialog renders just fine (displaying the list of recently used Outlook folders). However if I select "Other Folder" or "Copy to Folder" from the list, the resulting dialog is unusable. Only the icons in the folder-tree are displayed. All the folder names are blank. If I click just to the right of a folder-icon, a rectangle about 1 character wide is highlighted. Folders with unread items do however display the number of unread items in blue (e.g. "(5)").
I've tried excluding Outlook from being skinned, and tried various themes. None of these steps makes a difference. Sadly, this is a significant issue and means I cannot use WB. My hope is for Skin Studio to come out soon and allow me to tweak something so the folder dialogs are again usable.
I have validated the installation. It's quite possible that some other dialogs are similarly affected, but I've not spotted any.