Tabs demo broken too (but didn't see it before so don't know if it ever worked in IE6)...

Nope, didn't change anything, the correct content type is still being sent.

It's baffling, CSS3Pie definitely did work on Aug 2nd (see earlier post in this thread) but it hasn't worked since - and not just the examples on CSS3Pie.com, none of the live sites from other users (who have posted in the "pie in action" thread) work either.

I haven't changed anything on my PC, nor can I (it's locked down), and the IE version is 6.0.2900.2180.xpsp_sp2_gdr.080814-1233CO

Any ideas?

If you have (or create) a verbose build of CSS3Pie that emits warnings & success/fail messages to the debug console I could run that in conjunction with Firebug Lite to see where things are going wrong...

Thanks Marcus, that would be helpful. I don't have log messages in place currently but will try throwing some in for you when I get a chance (have been totally swamped recently). If you're comfortable with it you could try putting some in yourself.