Hi Charlie,
I have been increasingly coming upon an issue on older site, which used converted Global Blocks to Components. This comes from the days before Component Export was the norm.
If a Component Element is present on a page, the CS preview fails with the usual PHP error message and no preview.
As soon as I export the Component and use the export in place of the Component Element, all previews are back to normal.
Is this something which can be fixed, or is it a matter of digging through all Components and pages to find the problems? Front-end render is not affected in any way - only in CS.
Many thanks,
Christopher