Problems capturing with AVT-8710

[Tafflad]

After advice here I bought an AVT-8710 TBC to get the best out of my VHS conversions.
.Panasonic NV-H 800 > AV-8710 > ADVC300 > Sony Vegas capture
-----àsvideo --à svideo ---àIEE 1394
Started to use it for first time and very strange result – which is perplexing.
VHS tape has an opening sequence of black, then some title text, after about 10 sec , a then second title screen, followed 10sec later by gradual fade in of video.
If I play the tape .. this works fine.

When I digitized it without TBC all digitized OK, however when I digitized today with the 8710 in the path, the resulting capture has the first title screens OK, but when the second screen comes in the first stays .. so ends up with a text overlay mix.
If I look at frames individually they are correct, but when I play the DV file it’s screwed ….. weird ?
The rest of the video seems to have captured OK …
Thinking it something stupid … I cleaned video heads, and ran capture again … same thing?

Is there something I need to do here …………….. could there be interaction between 8710 & ADVC300 ? or is it something else?

Do I need to turn anything oiff on ADVC300 ?

[Tafflad]

There is certainly something weird going on ...
Here is an output screen grab which shows the problem Scene 1, Scene 2 and the output which has merged them ..



While creating screen grabs I noticed another weird thing that I guess is related, but don't yet know how.
I took the same 'merged' screen grab and resized it ... when I resize it by 50% the overlaid text disappears... nothing special just a simple 50% resize in paint. It is removing what should be there and leaving what shouldn't.
Appreciate any help on this ?