I was going through the control panel to find how to turn off the image resizing and in the same vicinity I noticed that my path for Attachment Storage Directory is munged in the display. (Found under Control Panel -> Feature Settings -> Attachements -> Attachment Storage Directory)
If the path should be "I:\Inetpub\webroot\forums\attachments" it displays as "I:Inetpubwebrootforumsattachments". If I change it to "I:\Inetpub\webroot\forums\attachments", test directory with good results and save it, it refreshes and displays again as "I:\Inetpub\webroot\forums\attachments".
I'm assuming it's saving right (or was unmolested in the upgrade) or else I would have had calls already on the uploads not working.
Thanks,
Tim