Thanks for the replies.
1. I've not tried either of the other uploaders yet - I don't like downloading stuff unless i really have to.
2. I have the Netcraft Toolbar - never caused problems previously.
3. I have't got the Ebay Toolbar.
4. I regularly use Crap Cleaner and Clean Cache, so hopefully there should'nt be anything lurking around to cause problems.
5. I'll file a customer help ticket as suggested.
Thanks for the advice.
Polybear.