I successfully updated my OS to the new Snow Leopard.
Everything looked fine until I opened a document in Quark... all the Helvetica Condensed / Helv Cond Bold was messed up. Kerning for the Helv Condensed looked like it was tracked out to 200, didn't fit text boxes, etc. The Bold was tracked IN by 200, all squished together.
All the other weights of Helvetica were fine. It was just these two.
Switching the font from Helvetica to Helvetica Neue did not help. Same result.
Eventually I switched the Helvetica Condensed to HelvCond Light, and the Bold to Light with a faux bold (it worked, oddly enough).
There has to be a better solution...