Thanks so much. I tried on all; easy, normal and hard, changed video card / in game video and mouse settings, swapped out keyboard and mouse, even re-loaded the entire game with 1.1 patch, but no luck.
I can whack off all tentacles easy enough on normal, but the game will not allow me to left click fast enough to fill the bar until it dissapears and I get thrown off every time. I must have tried just riding and clicking over 60 times after all 4 tentacles are gone, the game will not let me do it.
Aah, Such is life.
Thanks again.