Hello again,
well I discovered a strange behavior of the "previous/next"-button, when you hover it with your mouse and then move the mouse away, it disappears. Gone. So, if you want to use them, you must do that the first time you hover it - otherwise your chance is gone with the button: invisible.
The same behaviour I discovered with the category link, if you set the category to be shown and linked in the menu, the category name is shown beside an icon and if you hover the category name, it disapears, when you drag the mouse away.
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For your help I thank you in advance...
...best regards,
Christian

Dear C_Brand

please send us the screenshot to clearer about this issue

thanks

Shure, are screenshots, documenting the issue...
Here you can view some screenshots:

Hello there,
I am very sorry, my provided Superuser-account didn't work - meanwhile, I did fix this: my provided account informations will work now.
I want to apologize for any inconveniences you may had because of the not working account data.
Best regards,
Christian

Dear C_Brand

We just finished the days holiday. So can not help you right away.
please add the css below at the end of this file /templates/sj_personal/css/presets/preset1.css

.blog .item .entry-header .article-info >dd.category-name a, .blog .item .entry-header .article-info >dd.category-name a:hover,
.pager li a, .pager li a:hover{
display:block !important;
}

thanks

Hello,
well, perfect: it works. Thank you for your help.
Best regards,
Christian