iMac problems with Youtube?

[SethRogen]

I've had my iMac for a couple months. All of the sudden on Youtube the format of the front page totally changed for me, so I thought it was just a Youtube change.
The subscription stuff used to be in boxes in 2 rows of 4 and now the format totally changed for me and i had no way of getting it back. First, I thought it was just a youtube problem, but today I went on a computer at the Apple Store and logged into my account and it had the old subscription format is on it? Lol wtf?
I think I must have done something on my iMac because why did the old format just disappear and now I have this really annoying format.
Here is a picture of what I am seeing now and can't find a way to get rid of it:
http://img641.imageshack.us/img641/2029/helpb.png
I really want to get my old format back and I don't think it's a youtube problem anymore, just some setting I changed on my iMac.

[SethRogen]

Here is the format I got at the store. I also got the same/old format on my iPhone.
Here is a picture from it.
http://img17.imageshack.us/img17/8107/905b2f9e.png

[SethRogen]

I downloaded Firefox and it comes up normal. The problem is on Safari.

[Dwhite78]

I downloaded Firefox and it comes up normal. The problem is on Safari.

Reset safari. See if the problem exists.

[saxon48]

And upgrade to 5.0.1 if you haven't already...