Oy. I don't know about hte fix, but the folly of the installer/prior
owner perhaps was that wood floors should be installed in the
summertime, and the wood should be allowed to sit and acclimate in the
house for a good period of time to prevent this stuff from happening.

Short of reinstallation, I'm not sure what can be done. Sorry to hear
of this problem!

Todd H.
http://www.toddh.net/