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- In modules-admin it is shown as 0.34
Yes. This is 0.34.
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- The synchronizing function for topics gives only a blank page back and some of the topics are anymore viewed as if having -1 replies and beeing from anonymous in year 1970.
Perhaps, your server is weak.
Set enough small number for topic synchronizing.
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- Trying to open a topic with 467 posts ends in a blank page.
Turn PHP debug ON.
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- Where can I define a page-brak for a topic or for topics in a forum?
"Topics per a page in the view of a forum" in preferences.