CUPS hangs while adding new printer

[Jim Gottlieb]

I've been having a lot of trouble adding new printers.

I use the web interface and get as far as
Add Printer -> Model / Driver for printername
I select the correct PPD file from the list and that's it.  I never get a response from the server.

The debug log shows lines like these over and over:

d [24/Jan/2007:13:21:54 -0800] cupsdReadClient: 12, used=0, file=-1 state=0
d [24/Jan/2007:13:21:54 -0800] cupsdReadClient: httpGets returned EOF...
D [24/Jan/2007:13:21:54 -0800] cupsdCloseClient: 12
I [24/Jan/2007:13:21:54 -0800] cupsdCloseClient: SSL shutdown successful!
d [24/Jan/2007:13:21:54 -0800] cupsdCloseClient: Removing fd 12 from OutputSet..
. 
d [24/Jan/2007:13:21:54 -0800] cupsdReadClient: 12, used=0, file=-1 state=0
d [24/Jan/2007:13:21:54 -0800] cupsdReadClient: http error seen...
D [24/Jan/2007:13:21:54 -0800] cupsdCloseClient: 12
d [24/Jan/2007:13:21:54 -0800] cupsdCloseClient: Removing fd 12 from InputSet an
d OutputSet...
d [24/Jan/2007:13:21:55 -0800] select_timeout: 18 seconds to send browse update

If I try it enough times, it eventually works, but simple steps like shutting down and restarting CUPS don't seem to help.