I wanted to share how I fixed my CTD issues that cropped up after the “Fine-Tuning Update” in case it might help someone else.
Prior to the “Fine Tuning Update” Dirty Bomb ran fine for almost 15hrs. I used to get a little flash of my desktop when the map loaded previously but it always loaded.
I would get all the way up to the point where DB actually loaded you into the map. The last thing I would see is the loading screen that has the map overview. The game then crashed to the desktop. No errors or messages of any kind.
I tried verifying the cache and uninstall/reinstall but continued to have the same issue. I managed to fix my problem when I realized that both things I tried did not remove the config files located at Users > (your user name) > My Documents > My Games > UnrealEngine3.
After I deleted the UnrealEngine3 folder and re-verifying my cache, my crash to desktop issue was gone! 
My guess is that some of the common INI performance tweaks that were used prior to this patch no longer work and were causing the crashes.
TL;DR Deleted the Unrealengine3 folder located at Users > (your user name) > My Documents > My Games > UnrealEngine3 and re-verified my cache fixed my crash to desktop issue