Thanks @Robert, We have version 1.9.5. We don't have the custom form fields plugin installed, and we already excluded all wpForo pages from caching ...

thanks, I will check that out!

@robert great, thanks!  

@robert   thanks, the link is  

@martin Thanks, as far as I can see we don't cache anything at the moment (cache plugin is switched off and in the wpforo settings the cache options...

@robert ok thanks!  

@robert this is the page:  

@anonymous20 TBH, I would be surprised if this is an mySql version issue. It looks like its just a query that doesn't return the correct data. Looki...

@anonymous20 Thanks, yeah it doesn't seem to be a very common issue. I attached the version details of the server I use. I do use some plugins, but ...

@sofy thanks for the reply. However, I did not manipulate the database myself in any way other then using the wpforo GUI. The situation is that on...