What web browser did you use? The fact that your other person was able to edit the fields may be due to using a different browser or different version of the browser.
I have been using Safari to test. Everyone else in my office uses Internet Explorer. It seems to be running fine today on Internet Explorer 9, but still is not working correctly on Safari. I have not tested yet on FireFox.
Is that the problem then? Are certain browsers incompatible? Wouldn't (shouldn't) Safari be supported since FileMaker is owned by Apple?
Thanks for the help,