MyBB Community Forums

So Labrocca stated he won't be adding 1.8 support for any of his plugins.

I managed to install "PM admin" on my 1.8 board, which allows you to read all users Private messages from the ACP, and it opens the PMs in Javascript windows.

The issue is when I click a PM to view it, the popup doesn't open at all.

Any ideas how I can fix this?

The old plugin probably doesn't work because MyBB 1.8 series uses the jQuery library. Try this plugin instead.