I just tried this in my lab environment and was not able to reproduce it.
I have a few differences than you though; I am using VSC 6.1 with SnapCenter integration but I'm not running vCenter 6.0U1 yet.
Following convention, red usually indicates something is wrong. Even though my environment isn't like yours, I did try changing the Starting: field to different dates, and the box never displayed red.
If you're able to, I suggest opening a support case.