During rendering inconsistencies may be detected in the PDF or
in the environment.
For example if a PDF contains a corrupt image then it may not be
possible to display it. If a PDF contains a reference to a font
which is not on the current system then a font substitution may be
ABCpdf will do its best to complete the render even if errors or
inconsistencies are found. However it will log these type of issues
and make the log available via this property. This can be useful
for debugging purposes.