Did the NodesAsTabs add-on, possibly a few other small tweaks. Anywho...Private Message tab just shows the progress bar but not the pop-up list. Same with Alerts. But both show the new PMs or thread alerts if you click their tab or title. Thoughts on where I killed this would be appreciated.
A sibling shows all but my last fatal change and works correctly, I think I can replicate/know where I went astray. I walked away for a few hours (had to, life intruding) and feel fresh on it now. I should have more "children" - for spares.