There is an unwanted keyframe in my dopesheet. I can't delete it, move it, unselect it, etc. It doesn't seem to be connected to any object/bone.
It's the keyframe you can see to the far right.
It's similar in behaviour to what this guy posted on youtube(jump to 00:15): https://www.youtube.com/watch?v=9RSKKb5HcBI#t=15s
What is this?
Extra info: I tried installing a different build. But both Blender 2.71 and 2.72b behave like this(same .blend though).
I have seen this behaviour before.