i came across a bug in the j2me implemntation on nokia s60 5th edition (could also exists in other platforms)
try using the method using these arguments
this should draw a small pie section from 12 o'clock counter clockwise by 3 degrees
in fact it draw a full circle (same when using 2 and 4 degrees).
the number of degrees that trigger this reaction is from my tests depands slightly on the bounding rect.
if the call would be fillArc(0,0,50,50,90,3); then it would work (and for 4 as well) but now it wont work for 2 AND 1 degrees.
this needs to be submitted as a bug report to nokia.