Console shows the same error in both cases, so I assume that's not the reason:
Code
Uncaught TypeError: here.split(...)[1] is undefined
N https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
setTimeout handler*N https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
get_x3_page_settings https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
<anonymous> https://www.danielbollinger.de/panel/ line 2 > injectedScript:31
jQuery
[center]6[/center]
showFileManager https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
jQuery
[center]7[/center]
showFileManager https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
De https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
x3NavPage https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
initShowFileManager https://www.danielbollinger.de/panel/:458
show_left_folder_menu https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
jQuery
[center]11[/center]
show_left_folder_menu https://www.danielbollinger.de/panel/filemanager_js/x3_panel.js?v=3.31.1:2
<anonymous> https://www.danielbollinger.de/panel/:461