freezes on product import

Hello there,

Having a little trouble importing products:

While using the import catalogue feature and pulling products from a csv file it stops.

It usually loads between 25 - 100 products and then just seems to think its finished. Tried it with both firefox and IE and still does the same thing.

I was wondering if there is some sort of timeout i should be aware of - its turning a 10 minute task in to hours of fiddling and chopping of CSV files

the csv file is only about 500kb so its not overly massive.

any ideas?