Architecture / Installation

It is all very strange.....
Asked my webhost to check on errors..
came up with some vague answert of php-errors in php.ini
(I only started that to edit AFTER the error occurence)

and some dbase errors.

After receiving the reply, I suddenly could enter the website, run install (new version), , clear cache, re-index and update mysql.

So it is up and running again.

The only thing I can think of is that my webhost has done some upgrading and reset some presets which didn't agree with Tiki.

Thanks for all your help!