I found an error in the stateclass grid. When I fixed it, the model imported the stratum and stateclass grids just fine. So, I started a 5 year, 1 iteration test run using the 17 million pixel area. No error messages, but at 1 hour and 30 minutes, the model is still initializing and the resource monitor shows physical memory use at 97 percent of 16gb that I have in the machine. My guess is that the model is either not going to run or run extremely slowly given memory usage. I do need to run that large area, though, for a project. So, I may resample the input to 120m rather than 90m. That’s getting a bit large for pixel size, given the treatment scenario. So…any recommendations on a PC configuration that would run this model? And, does the model require Window 7? Most new machines with 32 gb of RAM come with Windows 8.