ProDAD - Support :: ID [58 ] :: 2007-09-19

Answer:

Due to an internal error, Liquid delivers random wrong video frames.
In this case the 'V' sign will be shown. Mercalli discontinue the analysis process to avoid further errors.

In those cases it might be helpful just to move the Timeline-Cursor within the timeline clip.
Then the analysis can be triggered again in the Mercally window.

Notice:
Remove the transitions on this clip!
This trick works if the background-rendering is off.
See also Link to the NTSC info.

Information: the above problem appears with several Matrox graphics boards (RTX).
With Mercalli 1.0.9 the issue has been solved.