Here is a screencap of what my Asset Store uploads look like now. It gets stuck at 0% forever and says it has a server error. Am I doing something wrong? I’ve got the entire listing set up on the Asset Store web site, it’s just waiting for this package upload to finish.
which version of 5 specifically?
Oh sorry, that might have helped 
I’m using Unity 5.0.0f4 Personal.
Any clues? The packages eventually got forced through after a couple of days worth of trying. I’m experiencing the same issue today trying to upload my latest asset. The weird thing to note is I’m uploading this asset through Unity 4.6. I wonder if there is some service I need to turn off or on within Windows 8.1 Pro to help facilitate the upload?