The issue was resolved with a full forum reset. Wish I didn't have to do that. :<

@nhl.pl said:

Please clear your browser cache and try again. It should solve your issue.

Nope! That doesn't seem to solve the issue.

Hey, I just installed NodeBB on a VPS, and have been configuring it. It's been working perfectly until just about 30 minutes ago. Any attempt to login/register will fail with Invalid session notifications. Which creates an issue as I can not log into any administrative account.This seems to be the cause of a NodeBB plugin. This can be seen live here. Any thoughts? Thanks!