Hello
thx a lot!
you have disable the Medium size: you should enable it since it's the default size of the picture page, and also because you use Automatic size, so between the thumbnail size and the way too large XL, only the thumbnails are displayed

Your pictures are great: you're such a traveler!

Can you please tell me which template you are using ?

Regards
Peter

Thanks for the info.

I have added also MobileThemeForTablets with activate Theme SmartPocketClear, but I do get the following error:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'mtt_activate_mobile_theme' not found or invalid function name in C:\piwigo\include\functions_plugins.inc.php on line 161

Line 161:
call_user_func_array($function_name, array_slice($args,1,$accepted_args) );

Any hint is welcome.