The cloth room was in Poser from Poser 5 and Bullet was added in Poser 2014/10 so they have no code in common.   Bullet being broken is due to them using the latest version of Bullet and something was missed in the conversion most likely.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14