Stack trace ends with megasas that means command to your MegaRAID (you probably have some RAID array) may have unexpectedly failed or it's a driver bug. I'd recommend updating MegaRAID firmware together with ESXi driver (and probably ESXi itself while you're at it). ESXi 5.1 is ancient but you can still get updates and async drivers from VMware site.
My gut ...
The creation of a trust creates at least two objects in the domain partition:
In the System container, there will be an object of type Trusted Domain (class trustedDomain) that has the name of the trusted domain.
In the Users container, there will be an object of type User (class user) with the name <NetBIOS name of the domain>$. This hidden user ...
I suspect your two-way trust might be the problem here. I can't think of a way to "hide" a trusted domain name even with the jiggery-pokery with CNAMEs.
You may notice a different result if you use FQDNs. What happens when you try "OLD.TEST.TLD"? I'd expect that to hit the new location. Perhaps.
Here's something to try: set up your CNAMEs ...
As above: "You should manually add an user account to the "Manage auditing and security log" in secpol.msc"
Some auditing software I used required messing with a GPO that specified a domain user to this security policy. By default the policy contains "Administrators", I put domain admins in there and ran the post-installation ...
Use the classical way that exists since long before there were dialogs to show or hide desktop icons:
Create a new shortcut on the desktop
For the target, enter:
Give it any name you want, for example This PC
Click on Finish
You can easily place this on the default desktop for all users or ...