Quote Originally Posted by michaelbsc View Post
Ok, then the observation is that random spots in the image appear to have experienced hyperdevelopment of a currently unexplained origin.

Places with little or no latent image have little effect, while areas with significant exposure exhibit significant effect.

Or, as you originally said, it is proportional to density.

Yes, that's correct.
I think my suggestion of stop bath being a possible cause was a red herring. I only mentioned it because I never use acid stop and only decided to on a whim so when I saw the spots I thought it might be a factor.
It's something about the developer. It was a newly opened bottle of Adox Adonal from the batch that landed in Sydney a couple of weeks ago. Diluted 1:50, normal inversion agitation in a Paterson tank. The PM I received said that Rodinal type developers are known to do this.