Not heard of that being a particular problem, and a search on the AAIB website only showed one previous at
http://www.aaib.dft.gov.uk/bulletin/oct02/glois.htm
However, I have read other reports where Jabiru aircraft tended to be overweight and out of CG. The case reported on the AAIB website would certainly be consistent with a very fwd CG and possibly overloading.
G