UE 4.26.2 - Missing cached shader map for material


I did update my UE to Version 4.26.2 some days ago.
(I do run UE on Win 10Pro.)
Now, when I try to edit a material, the window frezes and nothing happens anymore.

Normally, I do use a different location for the “Derived Data Cache”.
Default is on C:, I do use a modyfied Version of the “BaseEngine.ini” inside my Project folder.
It does not work for both locations.

Did such an issue occur to someone else?
Please, might someone know a solution?

Please, do let me know.

I attached the 2 log files.
And a screen.GG_dimoxinil.log (88.2 KB) ThirdPerson_Vorlage_04_3.log (76.3 KB)

Best regards.

The Sulution was to reinstall UE Version 4.26.2.

Best regards