Hi,
in 1.1 there were 2 displacement parameters - one for quality and one acting as a safety brake because the algorithm was not 100% reliable. In 1.2 we removed the safety brake, because the algorithm is now reliable... but then we found that some users actually set the quality too high and used just the safety brake to limit the tesselation, and with that parameter gone, they would run out of memory. So it is a problem of older build being more tolerant to incorrect setup