I am the admin on a low volume wiki that uses this extension. Our configuration uses the default value http://tools.pediapress.com/mw-serve/ for $wgCollectionMWServeURL.
Some of my users are periodically reporting that when they click on ''Download as PDF'', they sometimes get an error message: ''book rendering failed - there was an error while attempting to render your book''.
Is there any log files/debug options that I can use and/or configure on my side to figure out the cause of the failed PDF rendering?