Blank PDF’s

So…since the latest update, all my PDF’s became just a bunch of empty pages. When I long press anywhere in the page, the text is still there (I can even copy & paste)…but the app
Is just unusable now. The thumbnails look fine…
Already deleted and reinstalled it and nothing seems to work. This app is extremely expensive here in Brazil (something around $74,00). The developers do not care at all…already tried support within the app and through apple’s “Report a problem”…nothing so far. Anyone with the same issue?

Version? Operating system? Platform? Environmental considerations such as synch methods, other software installed, anything unusual about those PDFs, etc…?

Not having the issue myself but more details about your environment would help anyone who is so inclined to look into this.