[phpOpenTracker-general] Search engines plugin

Hi,

I've installed phpOpenTracker 1.5.2 and search_engines 1.2.0  (all using PEAR)
on a Mandrake 10 box with Apache 2 and MySQL 4.0.18.

The site I'm collecting stats for is on a separate Windows server, so I'm 
using the web bug for tracking.

Generally everything appears to be working, stats are collected and I can use 
the simple report - except for search engines. No data is being collected in 
the pot_search_engines table, even though pot_referers has records of search 
engines.

I've enabled error logging in phpOpenTracker.php but no logs are being written 
so I have no indication of any errors.

Has anyone had any similar problems or does anyone have any ideas of what I 
can try to get it working.

Thanks
Hans