Hi Sven,

Always use Joomla tools to investigate problem first, be smart.

Error that you mentioned, is popular when template developer or webmaster overriden addon, maybe you done it here?

Are you able to edit that page using the back-end editor?

I have not the time for this, i have installed a backup of the page, please make shure that such problems are solved in the next update and send it to me, the services here for me are ending in 6 days. im not amused.

Without debug info hard to guess a reason. I have also many sites with raw Helix Ultimate and SPPB 5 and no similar problems. Each case is different, like in Doctor Office.

Anyway thanks 4 trying...