What would be really handy is if you gave us the specs of your setup:
- version of eZ
- version of ezmultiupload
- type of webserver (e.g Apache v 2.2.17)
- version of imagemajick
And also what exactly you mean by "crazy". If you're using Unix/Linux and Apache paste the output of:
#> ps aux | grep httpd
What may also prove useful is telling us how big the file was you were trying to upload? If it was straight out of a digital camera or phone, it is likely to be many MB in size and you may observe the kinds of behaviour you describe.