Prim,
The two errors including T_OBJECT_OPERATOR = are indeed caused by using PHP4 instead of 5. After trying a restore with Akeeba Back I forgot to update .htaccess. I fixed that.
However, now I am back to the original problem:
Fatal error: Call to a member function children() on a non-object in /homepages/44/dxxxxxxxxx/htdocs/www.domain.com/components/com_gantry/core/gantrytemplatedetails.class.php on line 49, "(Notice) Trying to get property of non-object"
I am surely not an expert in linux, apache, php or jooma, but if I am not mistaken the gantry error is caused by not seeing any templates. I guess I need to figure out why the Template Manager is not working. I think the empty list in there is key to the problem!
I already checked file access and ownership. Both appear to be correct (755 and my user id).
Since 1&1 doesn't seem to provide access to the PHP there isn't much else to research.
Is anybody successfully using gantry with custom templates on a 1&1 business account?
If needed I can provide access to joomla admin, but there is really not much to see there... Besides the template problem Admin is working perfectly fine. I checked multiple other components without problems.
One more odd thing. I had to uninstall JoomFish to get admin to work.
Thanks,
Jens