Today, I downloaded and installed ESRI ArcGIS 10.3 For Desktop Advanced and then ArcGIS Pro 1.0. I assigned licenses, including a license for ArcGIS Pro, to account. I was able to authorize 10.3 and can launch that without a problem. I cannot, however, launch ArcGIS Pro. When I do, a message box appears with "timestamp invalid". No ESRI have been on this machine (clean windows install last weekend) Any thoughts about how to resolve this?