classic 3, with universalviewer 2.6.0 beta 2 - the top bar nav works, but the left and right, zoom, unzoom and rotate that show when you move the mouse over, do not. A click just zooms… it is like while those items show they arent clickable. I saw a bug report earlier of this issue being a bug in 2.5.8 or 9 or something and fixed in in 2.5.9.1
I wish i could find it again since the thread I saw showed it to be a bug the developer fixed there… but apparently not in the 2.6 beta 2