Can Not Save Project Plan as file

T

TS

I have a Project Plan from a user who claims he can not save.
I opened the plan myself and after four tries I finally managed to save it as a file.
Now when I try to open it locally it takes forever and the "Calculating" is flashing in the action box near the top left.

Someties it opens sometimes it does not.

The user told me that he copied some tasks from another plan.

Any solid suggestions on where to interrogate the plan for the LOOP..

It is about 300 tasks long with about 80% predecessors/

Thx.
TS
 
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