ContentBlocks 1.8.8 is now available with a fix for a rather old issue related to fetching layout fields with cbGetFieldContent. That would previously trigger an uncaught exception, but should work more reliably now.
Changelog for 1.8.8:
- Add [[+layout_title]] to fields as well [S19368]
- Prevent exception when using cbGetFieldContent to load a layout field [#441]