Random import bit rates?????????

My import settings are set to: 192kbps 48Khz AAC with NO variable bit rate. For some random reason itunes stated importing my music at random bit rates usually 3 to 7 kbps below my set rate. I decided to "factory refresh" my computer as it was time hoping it would fix the issue but nothing had seemed to fix it unless I install itunes 6.X and even then its a pain. 192 MP3 works great but the AAC encoder is having issues. Any suggestions? itunes says: "encoded with itunes v7.5.0.20, quicktime 7.3.1." is there a new codec or anything.

As I believe first came to light in this thread - courtesy of a heads-up from Flynn and verification and a workaround (if it really bothers you) by b noir - there was a so-far undocumented change in the new version of QuickTime (QuickTime actually being responsible for encoding song files in iTunes) which came bundled with iTunes 7.5.
QuickTime no longer supports Constant Bit Rate Encoding. In its place is Average Bit Rate Encoding.
Although this change is not reflected in the iTunes User Interface, it accounts for the new state of affairs that you noted.

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