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?Why do you think that wp fastest cache causes the issue?

As the issue started after installtion of the plugin, but stayed after deinstallation i thought some redirects were installed or simila.

Compared .htaccess with a backup, no changes.
But what worked:
Changed WP into maintenance Mode, reloaded page on mobile device, showed maintenance page.
Changed back to WordPress: Side loading now again.
Worked with 2 devices. But I dont have an explanation why.

Additional: The Request doesnt even seem to reach the webserver. The response is a static favicon, no website or code

Wait, found the “Enable instant approval” ! Unexpected in Theme instead of Calendar, my fault.
So if there is a way to hide the price information in the calendar itself, we are very happy. Looking forward to get my aproval of the club to obtain a license.

Thanks for quick response and cleaning cache !!!

FYI :
Incompatibility with Download Manager Plugin, cause different Bootstrap Version. Deactivation of Download Manager enables Menus .

Even a new created Menu does not work

Neither Web Menu not Mobile Menus are working…