Teensy 2 and Mouse.move()

Here's one that has me wondering about my sanity:

I built a IMU controlled mouse using a Teensy 2 and the Arduino Mouse.move() method. It works GREAT as long as the serial monitor is open. Once it's closed, however, cursor movement becomes very sporadic - as if the computer where only seeing intermittent IMU data. It's no longer fluid. The serial monitor can be in the background but it MUST be open to work well.

Here's where it gets weird:

It only happens on my laptop (Dell E6330) in any OS. I developed it in Ubuntu but it behaves sporadically Win 7, Mint, and Debian as well. I haven't installed the Arduino IDE in those other OSes though.

On my desktop machine, an iMac, it works beautifully.

Having to open the serial monitor to use the project is not really feasible.

What sorts of things can I try?

Posting the code would be a good, at least your setup block. Are are you using serial.begin() at all?

Well I feel silly. Removing the serial stuff made it start working like a charm. I just didn't think of that.

Thanks!