Did you try the streamscanner/media type detector on MWG or bypassing ICAP on the BC for flashfiles?
Bypassing ICAP and MWG filters work well, but we want MWG filters
What is streamscanner ? i did'nt find any option on MWG interface.
Could you post a screen capture of you AntiMalware Rule set?
In there you should have the streamingdetector enabled, which, as event, will enable the stream scanner.
There is no antimalware policy on my MWG. Only url filters based on user name/group.