Are you saying that you are losing existing BAS files?

If you are losing code that you entered in the Untitled IDE then the memory problem is doing that when the IDE closes. QB64 always asks if you want to save code entered even if it has not been compiled(run).

I'd say that you have permission problems or a lack of memory. QB64 seldom has memory problems!

Come to the forum if you cannot iron those problems out. www.QB64.net

Ted