Hi,
I have had no end of problems with the site locking when clients clicked checkout if they had a lot of items in their basket.
Very very worrying and costly. Well after a week of pulling my hair out. I found the problem.
Viart got back also after I had fixed it. Heres what they said after hearing I had added a .htaccess file with the following line
"php_value memory_limit 16M"
(my master setting is only 8M) I have php 4.3 only.
[Viart] Order info page has quite a lot of built-in functionalities and it takes about 6M only for loading all necessary libraries, functions and messages and for running this script, it is left less than 2M to run the script and when you have a big amount of products on order info page there is no enough memory to run the script so increasing of memory limit up to 16M should solve the problems.
Just thought this may help some other poor sole if it happens to them.
......right! at last an early night for me tonight