abrt version: 1.1.14
architecture: i686
Attached file: backtrace
cmdline: /usr/bin/python /usr/bin/hp-toolbox
component: hplip
crash_function: _dbus_marshal_read_uint32
executable: /usr/bin/python
kernel: 2.6.35.9-64.fc14.i686
package: hplip-gui-3.10.9-5.fc14
rating: 4
reason: Process /usr/bin/python was killed by signal 11 (SIGSEGV)
release: Fedora release 14 (Laughlin)
time: 1292591404
uid: 501

How to reproduce
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I run HP device manager. I chose: send a fax. I chose: add a cover page. I add an address to send the fax to (with its faxnumber). I type: send the fax and the gui crashes, but it puts the document in the queue. This document stays there forever, so it is not sent out.
When I make a document in open office write and print to the fax, nothing happens. It puts the document in the queue, but it is not printed(faxed). No error messages in this case. Scanning works. Testpage print works. Printer is HP officejet pro L7780.