That's weird, I uploaded the picture through the forum and it shows up in my browser. Perhaps it was a temporary hiccup from the server that serves the images.
The error states the following:
GenericArguments[0], 'MicrosoftResearch.Infer.Distributions.Poisson', on 'TDist SetPoint[TDist,T](TDist, T)' violates the constraint of type 'TDist'.
This might not be that important, as I'm in the process of converting this model to the newer format with offset indexing.
Regarding your last point - does using jagged VariableArrays still allow for efficient message passing/inference, and could you provide an example? A common case in my data is that the average observation length is 10 values, but a very small fraction might
go up to 100 or 1000. Using the 2D VariableArrays would hence result in almost 10 or 100 times as much memory as necessary. Running this model previously used to take over 8GB of RAM, so it seems like optimizing that part could reduce memory use significantly.