You know, earlier when I looked at the forums on mobipocket.com for release notes I saw a thread with someone having the exact same problem as you, he must be running the .067 as well. I upgraded.... last night? night before? when it was .065 and this version is working fine for me as far as I can tell.

Unfortunately I did it OTA from their server and didn't download a copy that I could share with everyone of this .065 version.

EDIT: here's the thread, you should create an account and add your feedback as well so they know more than one person is having the problem:

mobipocket.com :: View topic - Mobipocket Reader version 6.0 stopped working on my BB Curve