Well, I have seen that person and the computer that is used, altogether with the FB account. There are NO blocks from that person! Still, I am unable to send & receive messages with that friend. I know that there is a possibility to 'earn' that block due to too many messages, and yes, there were really too many messages from both sides (OK, my messages are more numerous, but there were replies to all my messages). Since it might just be a temporary block, I could not find any info on temporary blocks that will tell me how long this temporary block will last.
Have I made myself clear enough? Guys, this is The Problem, and I expect some help, not mocking with some fortunetellers. Get serious, please help!