what format are the pics?
What size? If they are over the limit _I don't know what it is_ they won't upload.
Can you upload another copy of the pic you have as your main now? That would tell us if the problem is file related or browser/connection related.
have you restarted your mac?
Try the Opera browser

first buying a stereo at walmart is criminal.
You need to bring your favorite tracks so you can hear the speakers with something you are intimately familiar with.
Find a place that has a listening room
Tell them your real price range
Do not go on Friday or Saturday or a holiday Monday
Try Tuesday or Wednesday
The best worst you could do is buy a boxed sony, panasoic, etc speaker system for your surround system. You may want to spring for the matching receiver.
The components will be matched and coordinated.
Buy it at a big box like Best Buy, Circuit City or whatever is local to you. Go in for several days and listen, listen, listen, listen to your music only.