Bug / Crash One Particle acts like kinematic

[alex798]

A sleep parameter of 0.1 is huge. That will freeze most particles in place, could be the problem you're having.
Try using something smaller, like 0.0001.

Also, don't use so many constraint iterations unless you've got a good reason. In most cases, using 1 iteration and multiple substeps (4-6) will conserve energy better and result in less stretching. See:
http://obi.virtualmethodstudio.com/manua...gence.html

Set sleep to suggested(tried this earlier too) but problem persist- one particle is like glued(surrounding particles is OK)...
Used big sleep to prevent any jittering near colliders...

I used the same constraint setting as in sample Rocker scene(if it's wrong- better change example), will look into bigger updater...