Yesterday, stumbled upon nasty bug in blender 2.48(a). Explode modifier behaves really differently comparing to 2.47. This is the simple example file:
You can see what the parts of exploded object detached not only from object itself, but also from nearest area (which is 1,5-2 times larger than the object). The things become even worse when spin and rotation applied to particles.
It took me some time to figure out the cause of the problem – SubSurf modifier. It was applied before particles modifier, but if we swap their order things will return in place.
Another way to fix the problem – is just to apply SubSurf modifier to mesh. Anyway, in blender 2.47 Explode worked with SubSurf irrespective to their order. A bug? Or bug fix?