windows 8.1 update1, geforce 660
tested in #dd9a33d and found the error
Short description of error
dope sheet's column select (alt + click) gets ignored after moving it's track in the NLA
Exact steps for others to reproduce the error
in the attached file:
-just move one of the tracks in the NLA
-select the moved track and press tab
-in the dope sheet below, try to alt click select a column of keys: it won't respond
-select the upper track and do the same it will respond.
-move the moved track back to it's place, and try again it will respond!