It would be helpful to see the calc you are changing when it crashes. or is it crashing whenever changing ALL calcs? And this is in a calc field definition? Or in the data viewer (FM Pro Advanced)?
And if you create a brand new, simple test field and repeat this process, do you get a crash?
If you don't get this crash on a new file, it may be that your current file is damaged. Try recovering it and test the recovered copy to see if you get the same problem with it.
Things to keep in mind about Recover:
- Recover does not detect all problems
- Recover doesn't always fix all problems correctly
- Best Practice is to never put a recovered copy back into regular use or development. Instead, replace the damaged file with an undamaged back up copy if this is at all possible. You may have to save a clone of the back up copy and import all data from your recovered copy to get a working copy with the most up to date information possible.