I was using version 126.96.36.199 U when I first encountered that problem. I am using DO on an SMP computer with WinXP Pro. Updating to version 188.8.131.52 U didn't solve anything. Here is the description:
After using DO for a while, at some point, when I go to "My Computer", it appears empty, although all of my devices appear on the folder tree. I should note here that after inserting a CD, or plugging an external HD, the newly found media are the only things showing up. At that time, it is no longer possible to drag and drop anything anywhere. I noticed that when that happens, windows explorer seems to retain all that functionality and that closing and restarting DO fixed the problem for a little while, so my guess was that it was not a system wide issue.
However, if at that point I try dragging and dropping something from DO to some other program, e.g. Nero, Winamp, etc., everything gets messed up (= DO hangs, the other program hangs or complains about sth and usually, the thingies associated with explorer, such as the taskbar, become non-responsive), and I have to kill dopus.exe from the task manager (because exiting and restarting it "normally" gets me nowhere and I end up with two or more instances of dopus.exe running but not showing up), then kill and restart explorer.exe, which again, fixes everything for a while.
The only program I can recall installing at the time when these problems first appeared was an update of ActiveSync to v. 4.2. I uninstalled, it completely, fooled around with DO for a while and the problem was still there.
Any suggestions or ideas are more than welcome