I learned a lesson: While cleaning house in "My Documents", I didn't know what the folder "My Fragments" was for so I deleted it.
Turns out it is required by Adobe Livecycle Designer 8.1, which SAP licensed and is one of the optional developer tools for SAPGUI and Netweaver Developer Studio. Deleting "My Fragments" caused my SAPGUI to lock up whenever I tried to open an Adobe Form. When I clicked in it, a SAPGUI popup said "Server Busy: This action cannot be completed because the other program is busy. Choose 'Switch To' to activate the busy program and correct the problem." Neither 'Switch To' or 'Retry' got me out of the loop - I had to log in again and kill my first session.
Executing C:\Program Files\Adobe\Designer 8.1\FormDesigner.exe directly showed that it could not open ...\My Documents\My Fragments.
Fragments are new ("preview") in 8.1 and are not supported by SAP.
Uninstalling and reinstalling did not fix it. I had to:
Create a new "My Fragments" folder
Execute C:\Program Files\Adobe\Designer 8.1\FormDesigner.exe
Go to menu option Edit-->Fragments-->Create Fragment…
Create new fragment library ...\My Documents\My Fragments\Fragment1.xdp
Searching Adobe's site, I found this note: http://kb2.adobe.com/cps/403/kb403720.html. That suggests it may also work to move folder C:\Documents and Settings\{user}\Application Data\Adobe\Designer to another location (like C:\Temp,) which would force Designer to re-initialize all its settings. I haven't tried that yet.
