For some reason, OOo 3.1.1 Portable insists on saving everything to E:\PortableApps\OpenOfficePortable\Data\Documents instead of the default E:\Documents created by the PA Menu (I'm using 2.0 beta 3).
Yes, I've tred reinstalling OOo Portable from scratch (completely deleting the E:\PortableApps\OpenOfficePortable\*.* folder and starting over with a fresh download)
E:\ in this case is my USB hard drive
EDIT: Clarification: I can still navigate to the E:\Documents folder from the Save As dialog, but it always starts in E:\PortableApps\OpenOfficePortable\Data\Documents.
The Open dialog starts in E:\Documents like it should