Could it be a DB permission issue?
Here is the info in the ‘Help’ tab:
### Begin System Info ###
— WordPress Configuration
Site URL: https://www.dyer.de/wordpress
Home URL: https://www.dyer.de
Multisite: No
Version: 4.6.1
Language: en_US
Table Prefix: Length: 3
WP_DEBUG: Enabled
Memory Limit: 40M
— Better Search Replace Configuration
Plugin Version: 1.2.10
Max Page Size: 21000
— Server Configuration
Operating System: Linux
PHP Version: 5.4.16
MySQL Version: 5.5.44
Server Software: Apache
— PHP Configuration
Safe Mode: Disabled
Memory Limit: 256M
Post Max Size: 8M
Upload Max Filesize: 2M
Time Limit: 30
Max Input Vars: 1000
Display Errors: On (1)
— WordPress Active Plugins
Better Search Replace: 1.2.10
— WordPress Inactive Plugins
Gmedia Gallery: 1.8.80
My Private Site: 2.14.1
Simple Custom CSS: 3.3
Snapshot Plus: 1.0
Velvet Blues Update URLs: 3.2.7
W3 Total Cache: 0.9.5
### End System Info ###