Threading bug?

Quite often I notice that a request to PyDS for one object retrieves 
another; this usually manifests itself as a failed CSS download, but 
right now I'm trying to delete a lot of categories and the categories 
prefs page keeps coming up as the telephone gif indicating that I am 
online. That is to say, the browser is sending the URL for the prefs 
page, and in response, getting the GIF image instead of HTML.

Is this a threading bug in PyDS, or something exposed/caused by Python 
2.3? I just upgraded to .7.3 and I'm still seeing this, and I think it 
may be related to load (which would be no surprise if this is a 
threading problem...).