@sindhuagarwal I've experienced the same problem. Lately (last few weeks) I've had less of a problem but for a while I was having to resize the window to scroll.

I've been a longtime Opera user and I love the browser.
The scrolling bar costs me time and aggravation now. Constantly having to adjust it because instead of scrolling, it minimizes. I hate it. It's twitchy.

Please change that back. It's terrible and I give it a week and then I'm off to Firefox.

I'm having the same issue which started early this morning (12-6-13.) Can't get past the insolent "don't you want a REAL browser like Firefox?" screen. Can't even click past it.

I suppose they tweaked it and now Opera is out again. I can't stand it. I love Opera and only don't use it when websites get snotty about it.