Hello/Hi/Greetings,

I have issue, after loading some photos I see that some of them are display as "?". The gallery doesn't display these photos, only icon with "?", but all of them can be dowloaded and are fine.
Piwigo 2.9.3
System operacyjny: Linux
PHP: 5.6.36 (Pokaż informacje) [2018-06-16 16:16:37]
MySQL: 5.5.41-MariaDB [2018-06-16 17:16:37]
Biblioteki Graficzne: GD bundled (2.1.0 compatible)