1.7GB Upload, Error 500

Update: I've been able to reproduce the problem and I'm working on figuring it out. It looks like some security settings are blocking the upload but I'm still sorting it out.

Awesome! Glad we can be of some help in solving this issue. On a side note, if you decide to up the limit again let me know. I will have a better computer in the next few months, and will be able to generate a map large enough to satisfy 4+ GB easily.