[support] can't reorder blocks after upgrade from 5 to 6

[Jody Cleveland]

I recently upgraded from Drupal 5.12 to 6.6 and now I'm unable to  
rearrange block order. I click and drag blocks to where I want them,  
and as soon as I save it reverts back to the way it was. I tried a new  
site within drupal 6, and that works fine so I'm pretty sure it has  
something to do with the upgrade.

Any ideas what may be wrong?

- jody