And I just discovered it's only here on zIWE that it happens, and only some of them.
Middle-click works on:
* Source
* Usage Stats
* "Logged in as ..."
* Site Search
* Random Post
Doesn't work on:
* Forum links
* Edit Preferences
* zIWETHEY Home | IWETHEY Board | Software and Applications
By "doesn't work" I mean that I middle-click on a link and nothing happens. No new tab, no load in the current screen.
I've checked the source and I can't see any pattern to it.