Hey, I had the same problem about 2wks ago...something is going around and still haven't figured it out yet. I had MS Myphone which backed up all my pics and such. But I couldn't even move things from my phones mem to flash disc, everything is locked down. I had to re-flash my phone!!! There is a post in my thread about changing some settings, hope this helps, please report back if it does! Good luck!
http://forum.ppcgeeks.com/showthread.php?t=66179