3 of 4 machines I have running MM are on Win7 x64.

The Win8.1 machine is a extra PC I just swapped a spare R9 270 in for some X11 mining.

Indeed. Wish I knew more about code but I'm hardware IT (A+ cert)
Java class was hard enough!

Nice article by the way bro 

What are you seeing in Windows Event Viewer in the application logs?

I notice it slows down the entire network speed and internet connection when it crashes as well.

The other thing I desperately need is someone to help me get my OneString miner, HexFury's working with my DualMiners like they used to before the BFGMiner 4 update.
Now I have to run 3 separate systems to run all the miners and I have to use BFGMiner by itself to run my OneString and HexFurys. Such a huge mess.
I am so tired and with my surgery happening on tuesday I am going to be in the hospital for 3 to 5 days.  I cannot have it all going to hell daily it will cost me big time.

Did you install the correct driver? Once that is installed, MultiMiner should notice your RBoxes after a quick scan.
What OS?

I linked the correct driver for ya a couple  posts ago. I cannot for the life of me get MultiMiner to even run on m Win8.1 machine here 

Yeah someone else here on the forums was saying how they had issues when mixing USB driven devices in MM.
Glad you got it working mate!

to get multi miner working on 8.1 I had to install .net 3.5 even though I am sure 8.1 already has .net 4 installed

So after yet more testing and crashes I find that MultiMiner crashes with .NET error yet BFGMiner and what ever other miners are still running and showing full speed poolside.  This is so odd.
It did not used to be like this.
Now if I do a full reboot MultiMiner will run again for 12 to 24 hrs before crashing again.
You can go in to task manager and close the miners after a MM crash yet MM will crash after a few mins without a reboot.  Yet again the miner software keeps running. 
I can't wait until Nate get back.