I have local files on the left and either code or remote files on the right. The vertical bar which can be moved left or right never stays put. For example if I click the "Expand to show local and remote sites" button, the verical bar will collaps to the left only showing file names, I have to manually move it back to the middle of the screen so that other file details will once again show.
Can you try clearing the cache? http://forums.adobe.com/thread/494811
If it still persists and if this happens all the time, it may be a bug. File a bug report: https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform