No Luck
None of these tips worked for me, but parallels is still useable for me. I have to forgo the virtual machines list and use the menu items instead. For my work for starting a VM I do the following:
1) File > Open
2) Navigate to the pvm file (/Users/[Home Dir]/Documents/Parallels for me).
3) Select the virtual machine I want started/modified/cloned/etc.
4) The vm should popup in its own window at this point.
Of course when I use mission control I can see the virtual machines list, but it never displays on my desktop.
Just for the record I have a hard month with Parallels. First I upgraded to 10.6.6, which caused Parallels 4 to stop working. I rolled back my machine to 10.6.5 (very time consuming). Parallels 4 worked again, but eventually I had to upgrade to 10.6.6 for other software I was running. I then upgraded to Parallels 6, which was working great until I needed full disk encryption which led me to install OS X 10.7, which seemed to be working until I began using Parallels with multiple workspaces. Now I at least have something that works, but still not 100%. Sorry in advance for the rant and good luck!