Yeah, the previous version we used was 1.5, so that figures I guess... I'll have to watch for updates even more regularly than I already do apparently

We both use 10.5.1 and Yummy 1.7.1b5, could it be an old configuration file in my Application Support folder or something?
Edit: Apparently this applies only to non-colunm-view (the appropriate name escapes me atm, sorry;) ), so I do have color bars in column view, just not in the other one, while on the other Mac you get color bars in both types.