For sometime now, can't say exactly when it started, all Flash videos have a strange startup delay. Videos buffer fast, no complaints, audio starts immediately but the video hangs there up to 7 - 8 seconds showing the first frame and then after this delay, jumps forward to catch the audio and finally plays normally.
I have difficulties to describe this, lets try with other words: I start for example a YouTube video. Audio of the video starts immediately, totally normally, but for the first 7 or 8 seconds the video only shows a still image of the first frame, totally frozen, then jumps to same time spot where audio currently is going and from that point I can watch videos normally. I lose nothing of the audio but visually I am not able to see those first seconds of the video.
When finally both audio and video streams are normal and running, if I switch to / from full screen, the same happens again although the video is frozen only 2 to 4 seconds (audio runs normally), delay being not as long as when video is started.
I have latest Flash installed, the laptop in question is the one told in my system specs. The issue is only when streaming Flash videos; disabling Flash for instance in IE11 and using HTML5 player instead, all videos (even YouTube) work as they should, both audio and video starting immediately.
Any ideas and suggestions welcome.