Module mounting greyed out

[Norsun]

In the 3D design tool, most of the buttons in my "Module Mounting" tab is greyed out.

It seems something is maxed out. If I select a previous array, I can edit (reduce) it. But not add any more?

I have about 11 sketched surfaces, and a number of module row arrays with several module rows under each, for a total of 399 modules. Is something maxed out?

 

I am a beginner with PVSol.

 

[Norsun]

Ok. Now it's working again. Don't know why.

 

I started working on a new model. Discarded that, and reloaded my original model, and then it works.....