Yeah, whenever I try to upload, I will sometimes lose all connection the PMC for a little while. So, I really believe it is a problem on their end.
I really hope this gets fixed soon though, I deleted my texture pack file from my post to upload the new one, and since it hasn't let me upload, my post currently doesn't have a downloadable file :/
--EDIT-- I can just add a mediafire link on the post, but still. lol
I am running Windows 7 Ultimate 64x, and Comcast is my internet provider as well. I tried Google Chrome, Firefox and Internet Explorer (I was desperate, lol).
Also, I get the same issue of not being able to connect to the site at all. Do you live on the west coast by chance?
On a side note, I subbed to you, I really like your content ^_^