Maybe it's Alt key bug in 2018 on windows that is causing the problem.
See if pressing the Ctrl key first then Alt+Right click works.
I figured it out, it seems to be a different bug. (I have to double tap ALT+Backspace to fill with foreground color though, thats probably the ALT bug)
I created another file and tried to recreate the problem and thankfully ctrl+alt+RC wasnt ruined. If you create multiple clipping layers and then turn off one of the layers you can no longer ctrl+alt+RC any of the visible layers above the layer that was turned off, it just selects the next visible layer below the hidden layer. If you turn on all the layers ctrl+alt+RC works as expected.