Why is this marked as resolved?
The hotfix doesn't work for a brand new WP site install as of 05/27, version 3.1.3.
From what I can tell - any site we've done an upgrade on since WP 3.1+ version has the same issues. This includes no function from admin for: theme installs, any image uploads (from page/post/media library), and any import/export of xml files to transfer site content/data. We've done exhausting amount of de-bug on this and it boils down to a lot of moving parts.
All websites prior to 3.1+ work fine, and have all functionality, no probs.
I don't blame WP, they deal out what comes to them and do a damn good job of it. The problem is the amount of change across the board, its too much to adapt any system or server to work with in a "Operational" amount of time.
All because of "the mobile demand" in my opinion, everyones scrambling to get it done asap and thats causing a cluster-muck for everyone.
Our fix is too roll every WP install back, prior to 3.1 - adjust the plugins as needed, then sit tight and wait for the real fix.
And that could be awhile I'm guessing, but I hope I'm wrong.
This isn't a complaint post either, it all works. Thankfully we're talking about parts of the admin functionality. The old FTP or other file transfer method gets it done on the newer versions of WP, but teaching or referring clients to use that method until a "fix is released" is a dead-zone.