neither; I was on this page https://ntvmr.uni-muenster.de/collation.
logging in and signing caused this page to start loading with Values John 6.0. the zero was probably the problem.
Doing the same without signing in caused no troubles.
As You see, I use the past tense: The problem seems to be solved. I could again use the page signed up without any trouble.
The problem with the zero-verse-value occurs sometimes. Mostly it just last a minute or two, but today it lasted for some hours.