I'm using Calibre the ebook viewer to view PDFs, DjVu, and ePub books. I don't know what version the program is, since I couldn't find any about dialog to confirm it. But I downloaded a couple of weeks ago. There was a update very recently which I installed, so this could be due to bad installation or something like that.
My problem is when viewing ebooks with Calibre viewer, two things happen:
If I try to choose them with Calibre open from my library, then they never finish loading.
If I open them from Windows, and I choose to "open with" Calibre the ebook viewer, the result is that they are displayed very badly, with a ugly standard font, with equations all ugly, It easier to show it so I will copy some images comparing how it's viewed with Calibre vs other viewers that work fine.
Calibre with a DjVu, all the pages looks like this:
I don't understand if Calibre is having a bug or if it's converting ebooks to some basic format. I don't understand why this happens. Help me to view books correctly.
Edit (day 06/ month 05/year 2016): I filed a bug report and got a response from the developer.