The risk you run comes from incompatible hardware and its drivers interacting with the diff versions of Vegas. The best example is trying to operate an advanced video card setup with GPU set to on. But really there are many other scenarios, from mouseballs, to high-end interfaces like from BlackMagic design.
I have been using V10 until a month ago as I am migating to V12 and have had V12 installed from the day it was released. Didn't noticed any stability issues with V10.
Hmmmmm? seems RoS has a memory lapse within hours?
About this subject;
Subject: RE: continuing crush in vegas pro12
Reply by: RoS
Date: 2/22/2013 9:21:54 AM
Using with V12 build 486, I have never had so many crashes in all my Vegas history which goes back to V3
The OP stated: for the stability of vegas 10 in any way.
So yes no problems with V10 having it installed alongside V12.
Now using V12 with the new 486 build and on a new project with mixed sources and V12 crashes frequently (5-10 times a day).
I did mention I wanted to be cautious about this because with build 394 and EX1 footage, all as fine so time should tell me what is the cause to the problem.
RoS thanks for your own clarification, but not withstanding, my first post in this thread is the most relevant and represents an experience of more than one instance. Thanks for adding your addtn'l info.
Sorry videoITguy, I went quickly through this thread and just noticed what you wrote earlier and it does make sense. I just wanted to offer some non-scientifc user experience :)
Before I install a new release of Vegas I make a backup image of my OS & applications drive. I then load a complex VEG and allow each of the different versions of Vegas to render. If all goes well I keep it installed. If I start to see problems during editing I can either boot into another OS install or reload the previous backup image.
Currently my workstations multi-boot between different configurations. This allows me to keep a known working setup isolated from new Windows updates, drivers, VEG releases, etc. until I feel confident they are solid. Back in the XP days bad drivers would sometimes mess things up... In the Vista days bad Windows updates would mess things up... However, every since Win7 SP1, I have not had any issues with anything, but my system is now (3+) years old and so most of the drivers are mature...