Back to topic: Since a few days I have the same problem that the UnrealEd-2.0-MRU is not stored (Win10) - in my memory I have changed nothing, it happend from one day to the other. I inspected UnrealEd with the Process Explorer: there are read operations but there is no attempt to WRITE to UnrealEd.ini.
![No Idea :noidea](./images/smilies/keinPlan.gif)