I just upgraded from 4.1.7 to 5.0.5...
Might be intentional, since its a deprecated function... but validate_list() is calling validate_renderer_list with the wrong args, so things fail in a violent way.
Found two plugins that were calling validate_list, one that I didn't realize was enabled and the other is lj_crosspost, which I seldom use, but missing it already... ;D
Oh well, off to figure out this new place...and see if there are any other plugins that didn't make it or how my skins are doing....
The Dreamer
Hello @thedreamer
Thanks for your report, we will keep an eye on this.