Tap to click trackpad function comes and goes?!

Tap to click and two finger tap for left click mysteriously come and go. When they go I can uncheck and recheck the appropriate box in system prefs and it works again. Sometimes it starts working again all by itself. Anybody else? Virus?

Update: I think the 1/2 second delay is too long of an estimate, but the delay is significant enough to make me notice something has to be wrong. My previous MBP had no delay.
When moving the mouse around, I'm not sure if it's a MBP issue, but occasionally the mouse seems to "get stuck" on the screen and I have to begin moving my finger again on the trackpad. This happened on the first MBP too.

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    (I accidently post this in the wrong forum -- for the old MBP -- so this is a repost)
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    Update: I think the 1/2 second delay is too long of an estimate, but the delay is significant enough to make me notice something has to be wrong. My previous MBP had no delay.
    When moving the mouse around, I'm not sure if it's a MBP issue, but occasionally the mouse seems to "get stuck" on the screen and I have to begin moving my finger again on the trackpad. This happened on the first MBP too.

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