Weird import problem - locks up and then tries to download admin.php

[RobParker]

I'm doing an import of VB3.7.

I've got no idea what's causing this but I successfully imported my users and avatars and started on private messages. It go to 53.88% and then firefox popped up with a save dialogue for admin.php (the file is blank).

I tried to continue the import process but straight away it just tries to send me the admin.php file again.

Completely puzzled here so any advice would be great.

 

[RobParker]

I'm also getting this if I try to do anything vaguely intensive like delete an old usergroup that's no longer needed.

What sort of values should I be using for the timeout?

Another comment from my host is whether anything is trying to use /tmp as a storage partition during the import as the database size is larger than this partition.