Hi Phil, thanks for the answer.
I don't know the insides of FL but my question is: how the LOG page was recording the info while the ACARS didn't? I suppose that if the comm with FSUIPC was lost, then neither the ACARS nor the LOG pages were recording information.
Like I said I had never had this problem so I didn't know what to do nor what the cause was. I noticed it when after flying for a couple of hours with no wind, it started blowing as per the small screen in the panel. When opening the ACARS window to find out how long it had been with no wind there was still showing zero. When checking the time column, it took me a while to observe that it stopped recording at 1:21.
I decided to go on because the LOG page was working but I was 99% sure that I had lost the flight based on my asumption that the LOG page feeds from the ACARS page.
But because God is a Pilot too, everything went fine eventhough my life expectation got shorter for those 3 horrifying hours:]
This is what makes flying fun!
Regards,
Hector