I have a partition that I am mounting via Parallels with a source of 'Boot Camp'. It's not really a boot camp partition, just a windows partition which I am attaching as another drive in parallels. This worked in Parallels 10 fine. It was mapped to drive letter F, and I have a number of links setup to that letter. Since upgrading to Parallels 11, every time I reboot, this drive shows up as drive letter E. I went into disk management and changed it to F, but it goes back to E after every restart. As stated before, this worked perfectly fine in Parallels 10. The problem started as soon as I upgraded.
A little more info... I added another CD/DVD Drive, booted into windows, got the Drive letters correct, and restarted. Now it stuck. There is something weird going on here. Although this is a workaround, something needs to be fixed. It's not the worst thing to have an extra virtual dvd drive in my windows install, but it shouldn't be needed.