Topic: Build Web Gallery button in Photoshop CS5

Today I installed Adobe CS5. I also downloaded Simpleviewer v2.
When I want to build a gallery, the button Build Web Gallery doesn't appear.

My screen resolution is 1366x768. Unfortunately I can't make this bigger, only smaller, because I read that this would solve the problem.

It also does not react on 2 times Tab and then enter...

What can I do to build the Simpleviewe gallery?

Please help! Thanks!