Hi kbc: The good news is that we are a software only company now so you do not have to buy hardware support from us :) Since you have a DL 4000 I was wondering if you have Rapid Recovery 6.1.3 installed as the patch refers only to this build. Please see below the best course of action to get your core GUI back. Please note that I have seen a few cases where neither the patch (nor the steps below) worked. 1. Download vc_redist.x64.exe and vc_redist.x86.exe from https://www.microsoft.com/en-US/download/details.aspx?id=48145 2. Download P-2377.msi from the link sent to you by the support team 3. Stop core service (and the SRM service since you run on a DL) 4. Install all three downloads 5. Start the core service Please let us know how it goes.

There is a patch which you can contact support to get. Or you can install the latest version of the core which is 6.2. It contains a fix for the issue. I'd recommend installing the latest version.