We've placed a bunch of Content Query web parts on our Intranet home
page and our log files have started to grow larger than normal.

After some investigation, we've narrowed it down to errors being
thrown by the Content Query web parts. Has anyone experienced this
before? It looks like an issue with the crosslistquery - is there a
setting we have to change to allow CrossListQuery functionality?

We thought the errors may have been due to customization of
the .webpart file and itemstyle.sxl, but still get errors without the
customizations.