My home computer is using CHIRP daily-20120701 and my computer at work is using CHIRP daily-20120919. I keep all my .img files in a dropbox folder. Every file I open at work has zero's in the offset column. The offet is not populating from a know working file made at home.
It appears the newer version is not backward compatible with the older one?
No, that's not the case. However, the two versions you're using likely have a lot of different code between them. If the later one is really the one misbehaving, then perhaps a regression has been introduced.
Please follow these instructions to file a bug on the website, and include debug logs and .img files so that I can take a look.
http://chirp.danplanet.com/projects/chirp/wiki/How_to_report_issues
Thanks!