Okay, took a quick look. Applied the backdrop change suggested and fixed the remaining errors on login.
I haven't tested on Classic versions or the 10.2.5 PTR.
Nor in combat - which may now trigger errors.
I uploaded an optional addon version to the addon page which can be accessed here
https://www.wowinterface.com/downloa...edVersion.html
Any further issues with it, please post there.
Or at the original addon pages other tab
https://www.wowinterface.com/downloa...get.html#other