Hi
I am reporting back on this topic of Mach 3 freezing.
I can't remember who advised me to install an earlier version of Mach3 to the one I was using.
This has worked. I have had no freezes since and I have been running some large files of several hours.
So, thank for the valuable help and all power to the forum!
Moonchpa

Excellent. I am pleased you have it working.

( The previous posting was here; http://www.machsupport.com/forum/index.php/topic,35585.msg243536.html#msg243536 )

Tweakie.