Configuration not saved on reboot DEVO10

Hi
I' m using the last nightly build for my Devo10, and I think the is a bug, or something I don't understand!
When I modify curves, ans check the "save" button at the right up corner (I hear a beep), the configuration is losed on the next reboot of the TX.
The only way for getting the configuration saved is to charge an other model, (I can see "model unsaved" on the list for my actual model) then going back to the model I want, the configuration is saved this way!
Strange! Thank you!