Technik » software or hardware problem

Hello,

On a simple project to engrave oak plaque my 840 machine has gone mad....all seems well then suddenly the router decides to dive straight down the Z axis almost through the work piece until it jambs and I hit the stop button. Ran the programme again with same result..I then edited line 410 and ran again with a successful result and completed project. Can anyone help the software is V carve desktop.

Please help.

I didn't find the right solution from the Internet.

References:-
http://forum.vectric.com/viewtopic.php?f=2&t=26048
Teaser video production agency

Thanks