I thought I'd seen somewhere that the last version was 3.x.x but , I
guess I was wrong , the 2.1.3 is the last stable (according to source
Here's a screenshot with my test on all characters cyrillic
(bulgarian) + latin :
(I guess I was wrong that a broken character breaks the rendering
sequence or it just happened in some other circumstances ) . The same
result comes out with 5-6 more fonts by the way , so it should be an
FTGL problem .