I've also had this happen at random times over last few months. I thought it was my computer, so reinstalled Windows.
But it still happens. Last time it happened was on 1st April 2012 when I opened Firefox for internet browsing. This happens with random applications, It's not happening with Firefox so far, previously Radarbox crashed when I closed Photoshop.
Another problem that just started happening after many months of non occurrence (which I and others have reported before), the aircraft has the globe displayed, but is not displayed on the map until unticking and ticking "process hardware flights".