Hi Andrei,
thanks for your answer. I agree that it shouldn't be IVAO's problem because it is common to get disconnected from IVAO during the flights. Yesterday was a common occurrence indeed. It is also true that we are having Internet problems in this country too. But it never happened for me to receive such a message. In fact, as I understood, the only time a connection is needed is when reporting the flight after finished. If the whole ACARS is recorded in my computer continuously, as I confirmed, and then reported to the system, then I don't understand how it could had happened. This was a short flight, but I think how bad it could had been after a long haul flight. BTW, I remember that one of the messages was that "a new Flight Logger version is available" but I am not aware of that.
Best Regards,
Hector