Page numbering within a chapter doesn't work!

Hi,

I'm new to Lectora Inspire and have a problem with numbering the pages within a chapter or section. I click on a chapter or section in the title explorer and try to start the "page numbering tool" - but the window just doesn't open! Seems like a bug to me. Anyone knows how to solve this problem?

Numbering pages within a title works fine. Only sections and chapters make problems. I also tried to open the "page numbering tool" by selecting it from the tools menu - just doesn't work too.

Thank you and bye,

Sandino