John
The video helps. I can't say I have seen that behavior before. Maybe I have and just don't remember.
For me the Now Time line and the Now time marker are attached.
From the reference guide :
The Now time marker
In the Track view, the Now time appears as a solid vertical line that followsplayback. When you set
the Now time in the Track view, the Now time marker appears in the Time Ruler. This marker
represents the point at which the Now time will snap back to after you stop playback or recording.
So according to this the Now Time Marker and Now Time should not be attached .
For me everything ran as normal untill this morning .
All the best
Jan