PDFLab did work fine on my system under OSX snow leopard for sever hours; it suddenly quit and did not even respond* - I really wonder where the bug is sitting.

It is not the first application that quits service under snow leopard in this way. The same happened for instance with visual hub - I got this one to work using some tricks, from case to case.

*it is not even visible when I look at the system's activity using "top" in the terminal.

In the case of visual hub, there seem to be some apple script errors. In the case of PDFLab, I really do not know. what the source could be... maybe someone can help me.