Running with 2 Custom master pages that previously worked on Server 1
Now a new server is established and "Invalid viewstate" now occurs – It's the mngfield.aspx that is involved
I can create a column on list or document library but can’t delete it again.
No changes has been made in the master pages at all.
If I change the custom master page to standard master page there’s no errors.
The URL when the error occur is:
The ULS log contains:
w3wp.exe (0x0c9c) - Thread: 0x0F78 - Level Medium and Unexected on the tkau