Apologies if this is a REALLY DUMB question, or the answer is freely available elsewhere, but it's driving me nuts.
I run http://www.tvcream.co.uk, and for the past year I've been happily running the WP Page Numbers plug-in to provide pagination within categories with multiple posts. You can see an example here: http://www.tvcream.co.uk/?cat=3
Since upgrading to WordPress 3.0, whenever I click on one of the page links (i.e. page 5, which takes me to http://www.tvcream.co.uk/?cat=3&paged=5) I get a "Page not found" error. Although, I should add, very occasionally, if I try page 2 or 3, the link works.
I have rolled back to 2.9 and that fixed it. But I'd rather not have to do this, because plug-ins and the like start to fall out of date. And the problem persists with 3.01.
So, any suggestions, please? The theme I'm using is Zinmag Remedy, if that helps!