upload jpg problem

[eluser]tfncruz[/eluser]
Ok... here's the situation...

Without changing anything in the code, sometimes I can upload images with no problems, sometimes I can't. The browser just stays there, thinking, and nothing happens.

MediaTemple insists that the problem is in the code... but how can this be true if there's moments when I actually can upload the images?!

I really don't understand this problem. I'm still thinking that the problem is on MediaTemple's server.