Hi there Bernd,
Funnily enough I would say that the starting issue just will be with Anti Image. But maybe things have changed ?
Anyway, especially for Engine#4 (Kernel Streaming) it still may be (or will be) so that Attended (which is what you apparantly are using) may have quirks or issues regarding the time position, and which even may end up in anomalies for the real playback. So, playing Unattendly (the checkbox at the bottom) is the real advise.
Also notice that the problem as you described it, is (without further anomalies) the exact other way around (ok, as how I see it) : it is just the time position which shows wrongly, while playback is ok.
Lastly, the end position of the slider has always been like that (unless it is the very last track I think), and I guess it will never change (say, too complicated to get that right, although it may sound unbelievable to you
).
In either case, don't change the Split File size to "solve" this, because it should be unrelated to what is really playing, while lowering the Split File size is not good for the best sound.
Again, if you use Unattended this will 100% be unrelated to what the time slider shows. Not because it is not there, but because with Attended it is more or less in control of playback. If all is right it shouldn't matter (or differ with Unattended), but for Engine#4 I know it is not waterproof.
I hope it is clear ?
Peter