Any debug options in ADE 4.5?

I am developing my own epub-eBooks (according to the standard idpf.org). They work just fine with Calibre, but ADE does not display the content. There are no crash and no error messages. I can see the table of contents but I don't see any content. The pages just won't be displayed.

So are there any debug options in ADE so I can investigate on this problem?

~Thomas