Select option changing to intersect

[Jeremy_Ray]

I've experimented with CTRL-SHIFT with the tools selected - if the normal mode is selected, all combinations of ctrl and shift are temporary. The tool returns to normal when they are released.

In the behavior I am observing, the select tools permanently switch to intersect mode. Until I select normal mode - but they soon return to intersect mode.

I wonder if num lock is causing this? I just noticed that it's been on this whole time. I've turned it off, will see what happens.