I recently returned to the game and installed the current client from scratch. Loaded a character and selected Use Outdated Addons but it wouldn't save when I reloaded the UI. I have to select it from the character list Addon menu and it will work but only for the first character I load. When I log out of a character the option is not saved. I have to select it again just prior to logging in with each character. Checked my AddonSettings text file and the first two lines are:
Clearly my selecting to use out of date addons is being saved to this file. Thus I have to wonder, is the problem the version number?
Many thanks and best wishes for the coming year