VIP Suite Scaler; Bad Status Value and Strange Mixer Behaviour

The problem appears to be resolved by adding timing constraints to the system.

I've still got an issue which causes the video to become 'skew'; it seems that not enough pixels are being clocked out (of one of the vip blocks, not sure which) so what should be a vertical line becomes diagonal left, etc.

Strangely enough, no timing constraints were needed in Quartus 9.0 to achieve the same result - guess there are considerable differences between 9.0 and 9.1.

Many thanks to Jake for going the extra mile! Guru status well deserved.