umg wouldn't save.

I was trying to set up a start menu cause I figured that would be the logical place to start, and the umg widget wouldn’t save, is there a trick to get it to save? Or something that I might have been doing wrong. Also one of my sticks of memory is starting to go bad would this affect it possibly? Thanks guys

All the other assets and packages saved fine though.

Most common reason for blueprints not saving is that they are open in another version of UE that has the same project opened.