First off, thanks for a great utility! i've only started using it last week, but I noticed something strange.

On the Statistics-Activity tab, regarding Mouse Movement and Effective Mouse movement data.

Most of the daily stats show -566509.98m (or similar figure) for Mouse Movement, but the Effective Mouse Movement, it makes sense (~600 to 700m). This amount will get slowly get bigger with each movement of the mouse.

For one of the stats, it is reversed, I see -566464.72m for Effective Mouse movement, and it shows 983.97m for Mouse Movement.

Finally, for one of the stats, it shows 901.17m for Mouse Movement and 542.19m for Effective Mouse Movement. This is with FreeMouse enabled(see below)

Possible causes 
I use a mouse wrapper Stefano Falda's Freemouse utility (www.babisoft.com). Though I've tried closing both it and Workrave then starting Workrave without it. I still see the negative amount.

This looks like a duplicate of 656.

Will be fixed in the next release.

*** This bug has been marked as a duplicate of bug 656 ***