This is also covered in the instructions in the read me and the FAQ.
WordPress uses posts per page to control how many posts show up (In “Readings Settings”, look at “Blog pages show at most”. You will see that it is set to 10.
To override this in the thumbnail plugin, use a fixed value for posts_per_page or try setting the posts_per_page value to ’999′. All of the thumbnails for your posts (as long as you do not have more than 999 posts), should display.
This should work:
[thumbnailgrid posts_per_page =’999′]
