I'm not sure if I understand it 100% ...
But there is a "security mechanism" in the wims.cgi kernel, prohibiting IP-adress changes during an exam.
If during the exam , there is a IP-adres change, all the raw-data are fine, but there is no score.
On our school we've has some trouble with "load-balancing" in our ADSL [4 leased ip-adresses] connections....leading to several changes within 45 minutes
A quick cure could be to alter a bit of C-code, and recompile.
So if you face this type of problem, it's not a bug , but a feature
