> bugs or trouble spots, fixed in future version
> IBO4.xx and not in 3.xx

???

As far as I'm concerned, the current version 3.xx is STABLE and widely used
for production. Version 4 is not about fixing things but about introducing
new features.

Have you noticed that Jason continues to provide minor fixes to version 3
while he has long been working on version 4? I'm sure if your main concern
is stability, then you should stick to version 3 for a while.

It just works, that's all!

tg