White page on thumbnail.php upgrading from 1.5.46 to 1.6.07

[xrawrglare]

Hello,
I know I'm late to the game, but I need to upgrade my gallery to 1.6.07.
I've done everything that the guide said, but the page thumbnail.php is white. Everything else is working.

Any ideas on how to fix it?
Thanks

[xrawrglare]

Solved. Was a theme problem.