Well, as I said in my previous post - after updating fbsuite everything became normal and I hadn't to make any more those changes I mentioned earlier.

I just used some (perhaps not much but still) older version that caused my problem. So I tried to fix the older, not the most actual version :S

Just looked into the actual zenFBcommon.php
and as I saw there is not isImagePage() at all.

Yah, I think I had removed it come to think of it because it wasn't doing what I expected. Now that my work scheduled has settled some, I should be able to dive into the plugins and release the html5 compliant versions either this weekend or the next.