File can't be save anymore

I have made an excel program and converted it with your xls padlock.
However, a customer now has the problem that if he wants to save the file, this will no longer work and the program will restart. The computer also slows down and crashes. You then have to abort excel.
Now I have sent another file to the customer but this file also does the same thing.
Running with “MyAPP.exe -del” does not work either.

Solved by upgrading to last XLS Padlock version.