[Quantlib-users] QuantLib's GBM found flawed. What say the experts?

[U.Mutlu <um...@mu...>]

A short standalone test code in C++ with test results posted online at
https://www.elitetrader.com/et/threads/simulating-stock-prices-using-gbm.375533/page-4#post-5861368
demonstrates that the GBM method in QuantLib
is fatally buggy and has been so since start.

Can the experts please check it and comment it.
It's suspicious that such a flaw in a very important part of the library (GBM 
and Monte Carlo)
got undetected by the experts and the user community for more that 20+ years.

Can the experts verify / confirm / duplicate the findings made there?
Or is maybe that test code itself buggy or the test method maybe unscientific?