Visitors only in Live Plugin (Piwik 1.1.1)

After my Update to 1.1.1 (maybe earlier) I noticed missing user data.
It is a Piwik Installation with 5 Websites on it. For Website #1 Piwik is showing everything right.
But for some other Sites the Realtime Users are showing, but nowhere else. (See Screenshot)

I use the Archive Function, so the data is processed once an hour.

I hope anyone experienced something like that and can give me a clue how to solve this issue.

Thanks in advance

it is probably that you are experiencing the ‘cron not working’ bug reported by a few users: Archiving doesn’t work anymore on 1.1.x with the cron script · Issue #1974 · matomo-org/matomo · GitHub
please post your server config over there to help find the issue