I guess this is probably up for the final release (apologies if I'm being presumptuous) but it would be great if when we get an error message "ReadImage: Unable to load image:" were told what image is being referred to. Otherwise were trawling through possibly stacks of objects and populations to find the culprit. Even better would be the opportunity to find the errant image.
This is one of things being worked on at the moment. The goal is to allow you to double click on an error in the Errors and Warnings window and have the node centred in the last focused network view and perhaps also open the param view for that node.