You may have a worn synchro.
However - what I have found is that the tranny on my GV does NOT like to be "hustled" through the gears - if you fight it (which my wife does), if fights back and you'll grind the gears, but "caress" it into gear and it'll shift smoothly - it's not a second gear thing for me, happens with every shift - it's a matter of not grabbing the shift and wrestling into position, just guiding it works better.
Everyone I've asked about this has reported that theirs behave in a somewhat similar fashion.