GG has looked at the dump but was unable to determine the exact problem and could not reproduce it either.

From the dump it looks like the program was "updating the Mask gui at the same time the playback engine rendering is finishing". I will save the dump in case a similar case arises -- bugs never go away until they are fixed so this one will most likely be back.

Still I found some oddity.
If I just open Cin-GG, I can switch on/off itles for tracks (default 1 video + 2 ch audio) and their content by using
first two checkboxes in window "View" .

But if I load video file (1 video track, 2 audio channel)
AND add effect to video track - I only can effectively switch on/off content/titltlebars for audio tracks!
Video track remain always with its content and titlebars. They sort of 'blocked' by effect track from
this change, even if I remove effect itself!

I have to reproduce this oddity for him and see what he has to say about that yet. gg/phyllis