Hi. First, some background in case it makes any difference ....
Mostly I use the desktop Dell with Windows 7 Home Premium. That's what I've been working with (except for testing this on a couple other computers). Comcast is the broadband provider. About a month ago we got a new Comcast modem and a Netgear N600 Dual Band Router. The old hardware was shot. All's been well since on the desktop and two laptops on the home network. No, no tethering a computer to a cell phone. But for the photo upload issue, WP blog seems pretty nimble.
OK, so I went to speedtest.net just a while ago. Ran it 3 times. The download speed was a consistent 28.86 / 28.87 Mbps. The upload speeds were 5.89 Mbps, .96 Mbps, 4.17 Mbps.
I tried a few things this evening. First, using IE and clearing the cache, I was able to use the multi-file uploader and that last photo that I had been trying to load ... finally DID LOAD on the first try! It took three evenings to upload that one .jpg photo. So, I tried another photo and got the same crunching .... and crunching .... and crunching .... issue. In Firefox, using the browser uploader, it tried to connect and then I got a "Page cannot be displayed" screen. I've tried a lot of things and by and large neither IE or Firefox seem to want to load a .jpg with the browser uploader. Almost all the photos that loaded, loaded with the multi-file uploader. BUT ... just now I tried yet another photo in FF with the browser uploader and it just loaded right up!
So, this evening things seem better, but they are still very erratic from the same endless crunching to giving a "cannot display page" screen to loading right up.
Thanks for your ideas.