After patching up to Patch 25 using the  Standard Patch upgrade the system returns the below error message:-

"The folder version is different from the version of the root folder"

To fix this, correct the entries created inside the AUPDATE Table, inside the X3 Reference Folder, in the below example:-

(In the Example below LIVETEST was updated, do this for all the last entries against all key Folders)

Once Complete you will be able to log into the Folder.