With 11e, I had to remove the installer version from my computer in order to confirm that the playlist bug has been quashed. In other words with both versions on my computer but only running 11e the bug was still there. So I would recommend having only 11e on your computer for testing purposes.
Looks like the installer version takes control over Vista and W7's random placement of .scr files. We'll be able to test this in time.
I don't know a good solution to this, but it appears that various people are using various different ways of getting and copying and placing and renaming the 11e .scr file. As well as various approaches to whether the 10d version is present, renamed, uninstalled, etc.
Results of testing will vary, and it's going to be very difficult to sort out the "works fine on my system" "but not on mine" symptoms.
It's not obvious from the release announcement how we
should be doing it.
As I said, I don't know a good solution. Just something to be aware of.
[Much less the differences with operating systems, etc.]