[Fluxus] physics problems again

[gabor papp]

hi all,

i'm having problems with the physics system again.

in fedora 12 even the simplest physics script with collisions works 
strange. if collision occurs the objects disappear. two colliding cubes 
or a cube with a ground plane show the same behaviour.

(clear)
(ground-plane #(0 1 0) 0)
(active-box (build-cube))

another problem which seems to appear when ode is compiled with double 
precision (tested in osx). i have this simple script which explodes an 
object:

(clear)
(hint-none)
(hint-wire)
(backfacecull 0)
(collisions 1)

(gravity #(0 0 0))
(let ([s (build-sphere 10 10)])
         (with-primitive s
             (for ([i (in-range (quotient (pdata-size) 3))])
                 (let* ([t (build-polygons 3 'triangle-list)]
                         [p0 (pdata-ref "p" (* i 3))]
                         [p1 (pdata-ref "p" (+ (* i 3) 1))]
                         [p2 (pdata-ref "p" (+ (* i 3) 2))])
                     (with-primitive t
                         (pdata-set "p" 0 p0)
                         (pdata-set "p" 1 p1)
                         (pdata-set "p" 2 p2))
                     (active-box t))))
         (destroy s))

with float precision it works, but with double precision it crashes 
fluxus. could someone test if it works please? do you have any 
suggestions how to track down these problems?

best,
gabor