Hi,
We stated facing issues recently for 2 users. This was working before, now started failing. ay be after we moved the servers from Linux to Windows.
We are using "Data center". This occurs for 2 users. They are part of listed groups.
Both users able to tag other users in Chrome browser and not using FireFox in my machine, and not able to tag anyone in their machines using both browsers. All of us are using same version of Chrome.
I have the user added under "Assignable User", "Assign Issues" & "Browse Users" under "Global permission" section.