#### Topic: Strange Bug in Graph

I'm using Graph 4.4 Beta 508. I've encountered a strange bug while trying to write a plugin, and I think I've been able to isolate it. The file attached is an example showing this bug.

To reproduce the bug:

Open the file. Right-click on the first function and choose Insert f'(x) and click Ok. The derivative is inserted. Double click on the new derivative function and then click Ok without changing anything. Suddenly the function has changed to a different function!

Notes: The function DISPLAYED initially is the correct one, but the formula does not match the function displayed. Once you click on it and click Ok, the function displayed changes to match the formula shown, which is incorrect. Saving the file, closing and re-opening has the same effect as double clicking the function and choosing Ok. If you double click the function and choose Cancel, the original correct function remains displayed, but the formula is still incorrect. The other function included in the file is a simpler formula for exactly the same function; however, this function can be differentiated normally and correctly.

Please let me know if anyone can reproduce this bug, or if it's just me. Thanks!

-James