PM runs quite slow

Dear all:

We use the Primavera PM6.2 for a project ,and set different level projects.

A new project created by copy from the baseline project., and update the process , the PM frozen, I cann't edit it .

We have opened the project and the data is loaded 100%,but the activity windows can not be load,the PM is frozen about 30minutes.

After opened it ,we check the project  integrity,the report as beow:

help me by email : mf20070425@126.com.thanks a lot.

54. Check Activity for: Completed activity Actual Start Date = Null
>>>Errors:
 Activity: MGENOOOO0130 - Not Fixed: Set activity Actual Start Date = Planned Start Date