I discovered what the problem was (or maybe still is - didn't check).
The thing is that the same problem occurred (blank screen) with other browsers too, what I checked upon @risingstargame suggestion.
What I didn't noticed almost all the way through is that my anti-virus-malware-etc. program blocked the page (although not entirely) but the frame that according to their report contained some malware bug. (It must be the one you are mentioning. So, as it turns out the program kept me safe and unaffected as it didn't allow that second frame to load.)