The first time I uploaded my video on Youtube, It took me 1-2 hours, it usually takes 1-2 hours on uploading videos, its normal. If you don't want to wait like 1-2 hours on your videos, you can simply reord our computer's webcam, which is at the top right corner and says, Record From Webcam, try that. and it would usaully take you 1 minute to ge it published.
about the coment and inbox thing, It depends on the computer speed, depends how much your computer is getting its speed connection.
And about the flash thingy. IF annytime you cannot have axcess to youtube.com and its videos, or any other site where it says to download flash. Just go to Mozilla Firefox, whenever the message comes to me, I open firefox and it gives me axcess.
Hope I helped,
Try Firefox, its better, stronger than internet explorer.