Probably a firewall / anti-virus preventing the version check from working. That’s the only difference between 0.7.0.x and 0.6.9, version checks every 12 hours and on first launch were added.
Speaking of which, a lot of people are about to get update notifications… hopefully this goes smoothly, because I’m going to bed 
Upgrading to 0.7.0.2 (here: SKIF v 0.7.0 - [ Manual Update Notifications ]), will make the notification go away.