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One thing to remember as well, which Andy(Crimea_River) mentioned in another post; make sure your photo(s) have all uploaded before hitting the "Post Reply" button.
Here the same, I use Linux without flash and it works fine.I find the "Flash-based" image uploader feature interesting, because it works the same for either my PC with Firefox or my ipad using Safari.
I should point out that ipad does not use flash, nor is there any way to enable it, as Apple refuses to support it.
I do agree though, that uploading images and adding text to the post can turn into a dog and pony show...it takes a little practice to keep everything in order.
I use Flickr, have for years. It just works and I have thousands of pictures on it now. I also use Adblock Plus in all my browsers which stops most of the pop up ads as well as a lot of the ads on any page.II use photobucket, which is a bit of a dog's breakfast these days, what with its pop-up malware infested ads. Anyone know of a good site instead of photobucket?