With regards to Green Ronin, if one is referring specifically to the long delay on the Faces of Thedas book, the fault there lies entirely with BioWare, as said company was ridiculously slow with responding on their end of the approvals process. From what I understand FoT had been ready to go for quite some time, with the only reason GR didn't publish it was that BioWare hadn't responded to give the final approval.
They've had some delays with their Mutants&Masterminds products, but then GR has generally been in the habit of not announcing release dates until the product is available for pre-order and the PDFs are available for sale due to having been burned in the past. They also seem to be focusing quite a bit more on their in-house AGE system, which would explain why there's not been as much new content for what used to be their flagship game.