I might need to access your ftp/admincp after that if you are still stuck.
Here my question: Where did get the Sales add-on the information from that those specific three forums have been sales forums?
I have all caches switched off.
I've checked all the widgets and can't see any difference to the dev-forum. I did suspect that a widget might cause this,
I found a solution which I do not understand.
Suspecting the widgets, I took off the homepage. After switching off, the error was gone.
Then, I took the home page on but commented all widgets at the home page off - just the title were on. It led to a empty home page with title. But: Same error!
Then I reverted the home page options from "element" to basic, changed in the main options the home page and the error disappeared. I took all widgets on home page step by step back and the error did not come back.
I have no idea why the way of linking the home page element at the navigation leads to this error. I have the setup running on the dev site without errors.
Now, after reverting and configuring as basic type, the error has gone.
I hope, you can explain to me what the cause might be.
For the time being, the problem seems to be solved.
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