xLabel-3.x stats support only 2GB of RAM. (The module is for 06.2006!)
You need to update to xLabel-4.0.5 or newer and load xStatsClass-1.1, then you'll have proper support for more then 2GB RAM.

Here's an upgrade guide to xPaintClass-1.0 http://www.xdocs.ls-universe.info/pie.php?Tutorials