[Guy Harris <gharris@xxxxxxxxxxxx>]

> I observed something similar as Lothar. I compiled all the source code
> on my machine (with standard optimization and then with -O3). Live
> capturing of connections to localhost work absolutely perfect. They are
> immediately displayed. However, capturing a PPP session (ippp0 on the
> ISDN card), something like four or six packets are displayed and then
> the application blocks (no repaint of the app window etc).
> 
> After I pressed stop capturing,

Well, it was at least capable of responding when you pressed the "Stop"
button.

If you run Ethereal under "strace", what does it report just before it
blocks?