Layout problem in the pdf configuration page
Please run the below two commands from the Magento root
grep -r 'remove src="css/styles-old.css"' grep -r 'update handle="styles"'
If it returns something like
app/code/[Namespace]/[Extension Name]/view/adminhtml/layout/adminhtml_system_config_edit.xml: <update handle="styles"/>or
app/code/[Namespace]/[Extension Name]/view/adminhtml/layout/default.xml: <update handle="styles"/>
please delete the line
<update handle="styles"/>
from the above file (please note this only applies to files named 'adminhtml_system_config_edit.xml' or 'default.xml'), save and cache refresh. If it returns nothing, please run
find . -wholename "**adminhtml**/layout/default.xml" | xargs cat
and forward the result to us via our Contact Us page so we can investigate further.