HAve you tried this with a brand new file? Seem like the file coulb be possibly corrupt.
I have not, but will give it a try when I have the time. I am spending far too much time on FileMaker issues (I also have a number of Access projects that are falling behind because of FileMaker issues), and it's driving me crazy.
I recall having this problem in the past, and either I created a new file or else restored a backup. If the latter, then it's understandable that the problem could recur.
Thank you for the suggestion!