What MSN Messenger versions are you using?
Do you mean the taskbar or the tabbed convo bar?
Edit: I see what you mean.
There is a delay which you can change in the registry (or Plus! Tweak!). The key is
GroupAutoSwitchDelay (it's not in charge of the flashing, but it's related)...
I believe it's 15 seconds (15000 miliseconds). Did you wait that long and it still didn't flash?
MSN Messenger 7 (latest) and it works fine here (with the delay).
Edit 2:
quote:
Originally posted by CookieRevised
The taskbar button flashes only when the conversation window is not active! This has always been the case in MSN Messenger and still is.
Indeed! I didn't notice their windows were active... It flashed for me because I obviously left it in the background (inactive).
/ 
