I can confirm this bug. I hadn't connected to Wifi for months and then did an upgrade to the latest Inkpad 3 software a couple of days ago, so I don't know which version is the problem.
I have attached a comparative screenshot. The good message for debugging is that the book is open source, so you could have a view at the Latex code:
https://github.com/LaurentRosenfeld/thinkperl6
At first, it did not work for me in either universal or fast mode, but after closing the viewer via the task manager and opening it again in universal mode, it works now (i. e., it displays correctly). So it's okay for me now, but still I'm a bit annoyed because it's a software downgrade. Before the downgrade, it worked "out of the box" (don't know whether that's universal or fast mode), now I had to google it and find out about the modes.
Hope this might help you with debugging
