SDP will not come up for admin users.  Non-admin users the website comes up just fine.  We are on version 9 build 9041 (upgraded 4-14-15) using MySQL.  MS Updates applied to the server just after midnight on 4-24-15 and the server rebooted.  After that is when this issue started.  We restored the server to the backup from 4-23-15 (using Veeam to restore the virtual machine itself).  The issue was still there (without the Microsoft updates).  The server had not been rebooted since updating SDP on 4-14.

There doesn't appear to be any new errors in any log I can find.  I have tried restoring the VM itself to prior to the 9014 update, ran the 9014 update, and then restored data from last nights backup (so we don't lose items entered since 4-14).  The issue was not there after running the update, but it was after doing the data restore.

I am not sure what else to try.  I am thinking something must be wrong with something that admin users have access to that non-admins don't.  The only thing that will display for admins is the header bar at the top of the screen.