After 3 tries to upload a 25MB package I give up.
Each upload where actually perfectly finished (controlled via my Linux box used as NAT router). The site responsed normal, showing "my uploads", but without the new uploaded package.
For smaller packs, 8-10 MB, I got an error "something wrong with the image" for each and every upload in the past. But instead of showing me the used upload page again (with the entries I filled allready), the site shows me the page to upload "2D/3D Art".
Please fix this ASAP if you have a need of quality content for the Poser category. I'm not the only one with this problems.