ok, that´s clear. I do however have another issue.

This one is with appending Ncache. When I try to do it (both in Maya 2011 and 2013) something weird happens. If I do it in 2011, maya seems to lose the collission of the hourglass itself, and the particles "blow up" in all directions.

In maya 2013 it stops caching particles, and just evaluates the next 2k frames without calculating the particles. Any ideas?