I update the software. It seems to work fine!
I updated meanwhile the project and my forum.
Yesterday I stressed mine and the project forum with loading the main pages and the settings pages in four browsers every 20 seconds for more than three hours, to see if I encounter a blank page or a 500. I've seen nothing related but I might have missed occurrences. We will see.
Trenne niemals Müll, denn er hat nur eine Silbe!