for example: in Windows(let's say XP) the Device manager will open a "new device" wizard and the device will appear as an unrecognized device. On a cluster with hundreds of such VMs, If that cluster has a health monitoring service it may show all the VMs in a "not healthy" state.
Is this just a hypothesis, or is there really such broken monitoring software?
This patch is a workaround to not show pvpanic in UI to avoid the problem in Windows.
It's not a workaround, it is a proper bugfix.
What versions of Windows did you test it on? Did it hide the New Hardware wizard properly (I think it appears only on XP/2003)?
Paolo