Hi,
Great work on this plugin.
I have a few admin modifications on a pretty vanilla 3.8.1 install - including some custom panels built using ACF and also qTranslate for dual-lingual content.
When I save pages the loading halts and gives the following notice:
TCPDF ERROR: Please explicitly set action attribute path!
The page content is saved correctly.
Any more info required - please just ask!
Cheers.