In reply to FH:
I had a run of ripped tips last winter, the first one went right down to the flesh and ripped all the skin off my fingertip. I found that once it had turned to a scab, I had to take off a lot of the dead flapper with scissors, and use a piece of fine sandpaper to keep the join smooth- so there wasn't a lip of skin to catch and tear again. I just kept doing this until I had a fresh tip.
I seemed to have developed a bad habit of crimping on greasy slopers, and I went through 3 more episodes of screaming and swearing followed by 2 weeks of recovery. What a pain.....
There's some stuff on ukBouldering.com about trashed tips, and a pic of the first trashed tip:
http://www.ukbouldering.com/tools.htm
Hope you get it sorted!