Is this problem special to Win32 systems?!?
Software that's working together with the network protocol stack at a low level can cause problems together with WinPcap.
Some known problems are:
SonicWALL VPN: When installed together with WinPcap 3.1, the network interfaces are no longer available (ipconfig /all doesn't show them)
<please append other known problems here>
If you have any such problems, you may contact the WinPcap team directly as the Ethereal developers can't do anything against it.
Is this a Win32 only problem, or are other OS/software combinations also problematic?
I had this happen to me using Windows XP Professional, Version 2002, SP2 and SonicWALL Global VPN Clinet, Version 220.127.116.116. This happens with both the 0.10.13 and 0.10.14 downloads of Ethereal. I would be willing to help debug a solution (firstname.lastname@example.org).