gtk-based sip client "locking up"

["Frank W. Miller" <fwmiller cornfed com>]

Greetings,

I'm new to programming with GTK and new to this list.  I apologize in 
advance if this is a simple question and I just havent dug hard enough 
to find the answer.  I've been through a number of programming docs and 
scanned some mailing lists to no avail  so far.

I'm writing a SIP client for Linux.  It has a command line interface 
currently but I've recently begun writing a GNOME GUI front-end.  I 
started with Glade and had reasonable success, i.e. I got it to where is 
was making outbound calls with decent UI interactions.  I then noticed a 
problem.  About half the time, when I started to make a call, i.e. when 
I was sending the first few messages of the SIP dialog, the GUI would 
"lock up" on me.  What this means is that I have a couple of notebook 
tabs and some entry fields on each tab.  There are also a couple of 
buttons.  Its pretty simple.  By lock up, I mean that at some point the 
GUI just stops updating the various widgets.  If I hit the tabs, it 
seems like its trying to switch between them but I just get white 
rectangles and no labels.  The program does not seem to recover from this.

I puzzled over this for a week or so and then thought it might be some 
strange thing with Glade so I went and rewrote the whole thing from 
scratch by hand.  I have the same behaviour from this version of the 
GUI.  I've come the conclusion that there must be something I am either 
doing or not doing that causes this and I'm hoping someone can help me 
with a pointer in the right direction!

Thanks,
FM

BTW, screenshots (if they will help) are at

http://www.cornfed.com/images/cornfedsipua/main.gif

http://www.cornfed.com/images/cornfedsipua/local.gif