I am using Generalized Mixed Models in GAMLj.

I want to plot interactions between a metric and a binary predictor when using a Logit link.

This works in principle, but as soon as my model contains a binary predictor, I cannot plot Random Effects any more. I always get the error "contrasts apply only to factors". Since the same is very well possible in a normal mixed model, I would guess that this is a bug - at least when plotting the logit ("linear predictor) on Y, also plotting random effects should always be possible.