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: …./_layouts/mngfield.aspx?i=1&Cmd=DeleteField&List=%7B347EBA87%2D794D%2D4A4E%2DB597%2DC21 520011A75%7D&Field=test&owshiddenversion=34&NextUsing= http%3A%2F%2Fportal%2Fsite1%2site2%2FSite3%2Fit%2F%5Flayouts%2 FListEdit%2Easpx%3FList%3D%257B347EBA87%252D794D%252D4A4E%252DB597%252DC21520011A75%257D
The ULS log contains:
w3wp.exe (0x0c9c) - Thread: 0x0F78 - Level Medium and Unexected on the tkau
the ULS Eventid is: xmnv xmnv tkau b4ly
Last Visit: 31-Dec-99 19:00 Last Update: 22-Feb-17 22:01