@baribak,
I was finally able to get the designs to open. Here is what I did:
-Open each component the design references, perform a compute all, and re-save
-Open the assembly (this time without crashing!)
For one of the designs, I went into A360 and promoted an older version. This seemed to fix the issue with constantly updating.
In the first design (the one I did not have to promote), going through this procedure broke all of the rigid joints. I am not sure why, but Fusion definitely did not like what was going on. I deleted all of the joints and re-applied them. Interestingly, after deleting them and attempting to re-apply them, Fusion kept giving me an error dialogue (this joint will result in a conflict) and saying that there was already a joint between the selected components. This was not possible, as there were no other joints. =/
In any event, I was able to fix all the joints and things are fine now.
Thanks for the help.
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Lenovo Thinkpad P1, 2.70 GHz Intel Xeon, 32.0 GB, Windows 10 Pro