Thanks for reply,

Firefox issue dissapeared after updating to version 29 and using Regenerate thumbnails plugin.

Scrolling issue – Chrome version 34.0.1847.131 – same as yours. There’s no problem when scrolling in Firefox, SRWare Iron (Chrome engine) and Safari. I will try again after disabling all browser plugins. If its browser plugin issue – it has to be pretty popular because I have tested this issue on 4 different machines – all with Windows 7 (EN ald PL), using mouse scroll and touchpad – and results was the same.

TESTED:

There’s still problem with scrolling in Chrome after disabling all browser plugins and restart :(