Thank you for your post.
Please post one of the crash reports, up to and including the crashed thread. This will let me know what area of the application is crashing, and possibly a cause.
It still could be an object that is corrupt on the layout. I've seen this happen with different version of FM and usually with the newer version cause the crashes. Run recover on the file to see if FM detects any issues with the file.
Can you connect and test with the same version of FM as the client? Test, to see if it then crashes with you.
Recreate the layout. Do not copy anything from the old layout to the new layout because you can copy the corruption.