Modifications to GUIDE corrupts M file

I am working with a GUIDE which includes panel, axes, list box and menu options. The corresponding M file has few thousand lines of syntax. When I try to add additional components to the GUI, the M file gets corrupt and only two hundred lines of code remains in the M file. I do not get such error while working with other similar GUI's.

Any thoughts on why the M file gets corrupted ?

[Matt J]

Did you attempt to rename the GUI at any point before this happened?

[Raghuram]

No , I did not do that. I add lets say one radio button, right click to select the call back function -- > The code is gone !

Answer 1

[ES]

see if this helps;

[Raghuram]

Generate Fig File and m File Option is already in select mode. I still get the error.