Hi, hugh,
The 'Oups' problem is solved !!
It was not caused by option 1) you mentioned, because it also occurs in my production environment when I upgrade to PHP7.0 and no filles were transfered so no files could have become corrupted.
It was also not caused by option 2) because I don't use that type of validation.
I found an element in my form that included both 'notempty' and 'isemail' validations.
On the 'notempty' validation it showed both 'publish(green)' and 'unpublish(red)'
On the 'isemail' validation it showed neither and I couldn't change the publish status.
When I remove the 'notempty' validation and I set 'Must validate' to yes on the 'isemail' validation, all works fine under PHP7.0.24!!
The strange thing is that the 'Oups' message occured on all elements that had a 'notempty' validation, not just het element I mentioned.
This solves my major problem, thanks to all of you that supported me in this thread.
I now will do a final test with upgrading to PHP7.0.24 and Fabrik3.8.1.
I will use FileZilla for creating my test environment instead of the PLESK control environment of my provider.
Hopefully the 'FabrikWorker not found' issue will also be solved.
I'll keep you updated
tnx, Henk