Nvidia GTX 960
2.74 official release
Short description of error
When I have selected several adjacent edge loops, deselecting(ALT+SHIFT+RMB) a certain one in the row sometimes persistently fails.
Unfortunately I can't find a way do reproduce this bug reliably. Comes randomly somehow but still quite a lot.
I found a similar, older, resolved bug report for 2.57 - but nothing up to date.