It would appear that a number of database related alterations were made to the newest compiler I’m using that have surprised me. I believe I have corrected all of the category related issues in build 2806, but it does appear that there are a few more minor issues occurring.
If you do update to 2806 you may find that when you attempt to do the first wallpaper change it will fail (might fail). If this is the case go through each of your categories in turn and check that any monitor specific settings that you may have are still active. If they are not re-check them. Once you’ve done this for all the categories it should be up and running again.
Once again, my apologises for the problems this has caused, I was taken by surprise by these compiler changes.