Intermittent errors when editing existing absences

Summary:

Users have reported intermittently experiencing errors when editing existing absences

Content (please ensure you mask any confidential information):

Users have reported intermittently experiencing errors when editing existing absences, upon hitting Submit. The error is "userMode: The value of the attribute UserMode isn't valid". The error has been seen in both the Me/employee tab, and the My Client Groups/HR admin tab.

Anyone else experiencing this or have any ideas?

Version (include the version you are using, if applicable):

26B (with a couple CWB patches applied)