Whatever. Maybe one day I will be back to Opera, but right now that looks dismal as Firefox and Chrome and working great for me now. Thank you for help
You're using Opera 12 - you really should have said that in the post. Unfortunately the video is quite blurry - and of course I can't click Details in the video to see what the error is.
Admittedly, Zoom, by stefanvd, is awkward but does make zooming in 1% steps possible. Don't rely on the sliding arrow, type in your number and then click in the arrow space.
I use and recommend http://download.cnet.com/PDF-XChange-Viewer/3000-10743_4-10598377.html for all my PDF viewing needs. It installed itself to the Opera Plug-ins but was inactive until I manually activated it and de-activated the Chrome PDF Viewer. The window in Opera is exactly like that in Windows, with all the options up and ready.
What version of Opera? What version of OS? Do you have any anti-virus installed? Do you have any problems with any other software on your PC? Do it does this on any website?