midi active sense?
Your problem is weird, to me.
I' m using a Xite-1 with a laptop though and i mainly use the sdk software.
But i do use the normal software occasionally and i have never experienced this.
I remember very old ago i had crashes (i' m talking around 2004 with the PCI systems)
on scope saving due to modular patches.
If you use Modulars you may test some projects without any of these to check behavior.
I know that "active sensing" midi message should be
filtered before sending the midi signal to devices because this could lead to crashes and i do it
just as a precaution not because i have experienced any crash.
(i filter the sequencer and physical midi with a midi filter module before routing the signal to a device)
i.e. Copperlan sends active sensing.
my system is win 7 professional 32bit, on a Fujitsu Life-book A series with i5-3230M Quad Core 3rd gen. 4GB memory.
I use the on-board GPU of the processor (hd4000)
i don't have any dedicated graphics adapter. Old type of disk drive, no SSD)
Very good performance, never experience any crash.
I have internet on, no antivirus, no system restore, disabled aero and stuff, 2 monitors OK.
Automatic updates off, and in general the only thing i update manually is the adobe flash, and Firefox.
No bios tweaks, i don't even know how to see the IRQ's.
And this is my main PC that
i do developing, web browsing, graphic design (Photoshop, illustrator, In-design, 3DS max), programming (VC++ 2008),
and i watch films, nothing else, no gaming (forgot i also write music

).
The only misbehavior was related to the htdm cable that if i move it the software will crash (lost communication etc),
but i have it now in a position that i never move it and i think for more than a 5 months i can't remember a single crash due to this.
In this machine i have also windows XP virtual box (oracle) because i run old Logic for the score editing
and some other apps, and yesterday i found how to make the virtual XP to access both my screens
(ok the story of my life).
It works.