Is there a bug in the system? My program freezes when trying to optimize pension splitting. Can't get past this bug.

Please clear your browser cache (or use a different browser) and try again. 

Yup. We did that and I spent an hour with a technician on the phone. 
Conclusion is that there is a bug related to optimization of pension splitting. 
I created a second return and had the same freeze. 
i created a third return and turned pensioner splitting off and it worked. 
But it was a lot of time to figure it out.