I have no such problem on Opera Developer 20.0, so let's put it down to an 'early version' bug...
:-/Posted: January 27th, 2014, 10:31 AM
I should also specify... Try a new tab, about:flags
Search for 'web platform' and enable that feature. Restart. This now SHOULD work properly for you.
However, my Opera 20.0 specifically has that feature disabled, so that I can have two Chromium-based testing platforms with two very different feature sets each (modern for Chrome, 'standard' for Opera). And they both work for me...
:-/Posted: January 27th, 2014, 10:33 AM
Oh... Silly me?
I forgot that my implementation doesn't follow the standards and forces the sticky flag for 'chrome' (which also includes Opera 18). But the worst that should happen is that the JavaScript in Wedge notices this isn't supported, and then treats it like a static element, which it is at that point for you. And me (on Opera 20). Hmm...