cache re-sets to zero when rendering on each and every frame

[3dsyn]

Some object you are importing is likely sending rogue reset notifications, or perhaps some bug exists depending on your setup.

Firstly make sure you're using the latest version. Then turn on "print sim reset info" in the debugging rollout and examine the maxscript listener during rendering to see which operator/object is triggering the reset. If it tells you what operator is triggering the reset, then you can narrow down what's causing it on your own. If nothing is printed and it still resets, then you most likely have run into a bug and should send the file to support@tyflow.com for me to examine.

Thanks for you fast response I'll follow your recommendations and let you know what I find.