[Ben Insler] “Not quite. You can’t change the timebase of a sequence once footage has been added to it. So, the workflow really goes:”
Yes. You can. You can switch from drop to non-drop at will, at any time. Thats not the same as changing timebase, which refers to frame rate. Non-drop and drop are the same frame rate.
Its a dumb bug, but its easy to work around.