"count" and "itemCount" are two different parameters. "count" is used to specify how much images will be selected from an album. "itemCount" is used to specify how much images will be shown per row.
If you want to show select only 5 images from the album and show 5 images per row, use the following plugin code:
{arisexylightbox activeType="picasa" user="100559838186911089334" album="SanMarco" sortBy="random" count="5" itemCount="5" theme="fancy"}{/arisexylightbox}
This code works fine on our test server. If it doesn't work for you, could you provide a temporary access to your J! backend by
email so we can investigate the problem?
Regards,
ARI Soft