When the program encounters a problem, it rewinds 1 day and tries again.
If it still has a problem, it rewinds 1 month, and tries again.
If it still has a problem, it rewinds 1 year, and tries again.
If it STILL has a problem, it gives up, and issues an error message.
This appears to be what it\'s doing with your current model. There may be something wrong with the combination of values in the parameters used, and it\'s trying to adjust. Not all combinations are valid, but the only way to find the \'bad\' sets is to run them.
Let it continue, at least for a few hours. Post again if it is still doing it, with the dates returned to each time if possible. This may be valuable info for the programmers.