Projects Block does not work

Hi,
I have Fundingpress 4.1.3 installed on WordPress 4.6.1.
I use the default Home Page with projects block with slider of 6 projects and grid of 12 static projects. Here are settings of the Projects Block:
Title (optional): <blank>
Categories: No
Display options: Show both (Static projects+Slider projects)
Number of slides: 6
Number of static posts: 12

And I see a slider with 6 projects and a grid with 12 projects.
But when I try to change the settings, i.e. 7 number of slides or 8 number of static posts, the result is a blank projects block.
I try also to build another page with a new Projects Block and a Highlight Project Block. But whatever data I put I get always a blank projects, while the highlight project block works well.

Thank you.