Hi, just tried v5.12.7 using CoreAVC + AC3filter codecs for AVC video.
Seems to work now, it's even sync.
But there is one more problem left.
The image is cropped to 4:3 (so it isn't shown completely on my 24" 1920x1200 display, there are black bars on the right and the left side and half of the channel logo is cut away) and when not in fullscreen mode, the image is not even scaled down to the progdvb window but it's also cropped.
This means that the size of an object in the tv window is not scaled down when resizing the progdvb window but it's just cropped away even more, so an object remains in the same display size instead of scaling down.
I hope this is understandable.
Hope this will be fixed soon so that I can watch hd channels.
Btw. recording the channel gives the full picture.

Your screen should be 16:10, supposingly you did already set letterbox for 16:10 in DirectShow settings.

Did you check the codec's internal settings / properties?
The codec would have to assist on scaling, somehow, same as my hardware does it for me.