This is more of an odd feature rather than a bug but very confusing for users.
If a search is run that displays a list of matches and an image is clicked it will show the large thumbnail with Previous and Next buttons. The problem is that the Prev/Next buttons link to the prev/next image in the album (of the image you are looking at) but it should really be the previous or next image in the search results list.
I've had a look at changing the code for this but it gets a bit tricky as the you'd need to keep the search terms persistent. Perhaps a better way would be to make a temporary list (like a temp search album) that could then be navigated in the same way that a normal album would.
I haven't looked at Beta 3, can anyone tell me if it is resolved in that version.