Similar problem here after I updated to .61.
The update cleared all of the custom ringtones I had set for about a dozen people---no big deal, I just set them up again. However, the phone uses the default ringer for every call.
I also noticed that when I go to edit my contacts, the custom ringtones aren't automatically listed on their contact page. The only time I can see the custom ringtone is if I try to edit a contact, scroll down to ringtone, scroll down to Phone, and press the trackball.
From all of the posts about this, it seems that .61 broke something in the Custom Profiles set-up.

So far, that's the only glitch that I've found (except that I did the update OTA and when I plug into DM, I get a message that the .61 update is available).