Well, yes. But aside of J.A.C.K. editor, everything else works well and even runs faster than before. It's a bit weird, even installed the 32-bit version and still the same issue, and worse because it also happens with the 3D camera.
I've also been doodling a bit with the 2D viewports and toggling the auto-selection tool seems to fix it on only one viewport. Then selecting on other viewports gets stuck again. I do not get it. Perhaps since it's been 6 years when J.A.C.K. got updated for the free version, it got more buggier on recent updates of Windows.