Administrators: Here's a New One

2 microseconds?  That's way too much time, try more like 2 yoctoseconds. 

Seriously, it is a bug I'm aware of, although I don't remember the explanation for why it happens to some people and not others.  There is no time limit set for deleting posts.  If I recall correctly, even when a time limit was set, the error still occurred.  I believe this is fixed in the next version of the forum software which is due to be completed later this month.
 
As for the double post, a couple of alternative options you have are a) remove the text and replace it with "it's Jeff's fault" (or some other lighthearted statement) or b) use the report link and ask for it to be deleted.
 
I know this transition hasn't been perfect and I apologize for the inconveniences caused by the recent upgrade.

David Voss wrote:

2 microseconds?  That's way too much time, try more like 2 yoctoseconds.

David,

Thanks for the complete, and humorous update.