I use Blender 2.77a on Fedora 24 and a laptop that is older than my deceased grandmother, if that info is relevant.
I’ve encountered a problem with mesh display recently. When I select edges in vertex select mode, Blender highlights the selection weirdly. Instead of fully highlighting selected edges + drawing a fall-off highlights on edges that are connected to selected vertices, it fully highlights some random adjacent edges as well as selected ones.
Here’s the screen recording of that behaviour that I made (31 sec).
Selection highlights work correctly when the mesh is set to smooth shading, but do as described above when switched to wireframe display (I forgot to include this in the video).
And also while recording I noticed, that smooth shading is applied to mesh only when it is selected, so when I select something else - the mesh appears flat shaded and triangulated.
I thought the cause might be that I launch Blender from an executable in the unpacked tarball (from the official blender download), instead of installing the software on the system. So I properly installed the same version of Blender with the package manager, but the problem persists. Thought it is not a critical problem, it is still very annoying.
Has anybody else encountered similar issues?
It doesn’t look like some lost checkbox I don’t know about - it looks more like a bug, but I thought I should post that here on blenderartists before sending a bug report.