I have in the past test flagged successfully after members mentioned not being able to. I have not noticed a flagged post in weeks though by members but did see GA's test flag.
Please keep on trying to flag them guys or as you know your welcome to PM any of us if you keep getting an error message.
Thanks again everyone.
Edit: GA, I seen your test, I clicked it then went back to recheck it and it was gone. I believe once someone has opened it completely it marks it as done automatically and the rest of us don't get to see it like we used to.