Model Size Reached??? Huh?

What would cause me to receive an error saying, "Model Size Reached. There currently exists a model limit. Model size must stay below this limit." I didn't think there was a limit to your model size once you owned a license of the product. I knew there was a limit on the demo models. Am I doing something wrong?

Please have a look in your menu Help>License Activation>View Licenses

There you can see your full license information. In my case there is a line with "INCREMENT nomodellimit flexsim 6.0 permanent ...". Maybe your license has other restrictions.