Gallery plugin hidden when GP theme active

Hi everyone,
This is a wierd one - a collegue has found a nice gallery plugin that a client likes (because it has thumbnail images below the slideshow)
I did a test on a brand new WP site, created a gallery all working fine.
Installed GP theme free, the same page does not show the gallery - I looked in the source code and it all appears to be the same!
Switched back to another theme and it displays fine!
I originally had it in a GP container, I took that away so the shortcode is all that is on the page, no change.
Any thoughts ?
TIA, Dave

ps - the GP child theme is currently active