ChuckP, is this an immediate float effect or only after it has been in the washing slot for some time as others are reporting?

I wonder if this is both time and type of liquid dependent? I haven't bought any MGIV for some time so I will have old stock but I use a Nova vertical slot processor and on the few occasions that my Nova clip has slipped off the paper in the developer slot it has sunk immediately

Thicker and stiffer than the Agfa MCC it may be but I'd have thought that the density of the paper wouldn't change sufficiently to make a difference. To my non scientific brain doesn't stiffer and thicker indicate that the paper is more dense rather than less so less inclined to float?

I wonder if Simon Galley would care to comment on any change to MGIV paper that might account for this change from sinking to floating?