weird upload problem, apache 2, php 4

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http://serverfault.com – im kinda new to this site, im hoping someone can help me out! A couple of our clients reported that they cannot upload files in theire CMS, they keep getting half uploads or no uploads at all. So far it occurs with image and pdf files. The weird thing is that whe cannot replicate the problem ourself, we've tried every possible browser version and operating system and we get a succesfull upload every single time! (very frustrating) The site setup is very simple, a normal html form with an upload input field, at the server side we just take the php _files directive and move the file to our own (HowTos)