Pynotify runs fine interactively, but crashes when

I am attempting to use pynotify for a small project, but am having a strange problem on my Fedora 13 machine. It appears that when pynotify is run programmatically it crashes when show() is called - however if I type that line myself it runs fine! I have tested it also on my Ubuntu box, where it runs absolutely fine.

My testing code is:

import pynotify

pynotify.init('someName')
n = pynotify.Notification("Summary", "Body")
n.show()

And the results of running this:

$ python -i test.py 
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    n.show()
glib.GError: Unable to connect to server
>>> n.show()
True
>>>

So, does anyone have any ideas what may cause this sort of behaviour? Unfortunately the Fedora environment is one that I have little control over, so any solutions requiring root access/etc would not really work. I can try installing pynotify locally, however, if needed. Thanks for any help.

Since Owen has not accepted my offer to take this answer, here is the solution that worked for me. Note that I have no idea why this works (other than vague guesses), and that I don't make any sort of guarantees about whether this is a good solution or not, but maybe if you are ever in as odd a position as I was this will help.

If you execute n.show() twice, it will run successfully the second time. Therefore, in order to avoid setting two notifications on a system where Pynotify does work correctly, I have used the following:

import pynotify

pynotify.init('someName')
n = pynotify.Notification("Summary", "Body")
try:
    n.show()
except:
    n.show()

Note of course that this small example has flaws, least of all the outcome if there is an actual problem with Pynotify that will be thrown on both n.show()s - this is merely a minimum working example.