Photopaint X5 won't save jpegs on Win 10

I'm running Photopaint X5 on Windows 10.Once I had sorted the menu bar problems, everything worked well until a  couple of weeks ago. Since then, I have not been able to edit a jpeg and then save it. It looks as if it has been saved in the normal way but the file vanishes. If I save it as a CPT, all is well. Exporting as a jpeg doesn't work but saving for the web does. This solves the problem but it isn't an easy way of working.

Can anyone suggest a solution? Does this only apply to X5 or are the other versions having the same problem? I would be prepared to upgrade to the latest version of Photopaint but there's no point if it is a Win 10 compatibility problem.

Thanks

Meyricke