Pages using the Colourize theme don't display after update to 6.15 and various modules

Hi,

I'm struggling with where to even start looking. I updated all of my modules and core yesterday of a Drupal 6 installation. Everything went well except now I can't get to many of the pages of one of my sites (this is on my local test pc) of a multisite installation. If I change the theme to garland or something standard, I can get to the pages. If I set it back to Colourise, I get a message in ie8 that Internet Explorer can't display the web page. Any idea what could be up? I did not update Colourise.

Thank so much, ctb.