I get the yellow triangular symbol with an exclamation mark in the system tray, along with a bubble bursting sound. When I hover over it, nothing is displayed. When I click on it, it disappears.
I don't find any errors in the event log. I have event log service set to manual, and it doesn't turn on when Windows starts. I start it, but when I get the yellow triangle in the system tray again, still no errors in the performance logs. I will try restarting Windows with event log service set to automatic.
The exclamation mark shows up when I am using the file sharing networks. On my own speculation, I think it may have to do with the number of network connections exceeded, as I seem to remember coming accross something like that in the past, but I can't remember this now. I may be completely wrong as well.
Windows doesn't show any ill effect. Everything goes on as normal during and after the exlamation mark warnings. I just want to know what the heck it is.