MT weirdness

I'm having the weirdest problem with an MT blog I'm trying to set up for a friend. Since she had a brand new installation, I set up her main blog using the PHP stuff. And then tried to create a second blog using the Perl MT stuff. But it won't write the archives. Ever.

So I converted her first blog back to Perl and still no archives on the second blog but she has archives for the primary blog.

Any clue what's going on? I've checked and rechecked all of her config stuff and am not seeing it.

Thanks!

Update: I had broken MT tags in her individual archive and once I figured that out, her archives work. Whew!