Hi,
1) Do you use Proxy ? It's preferable to use Proxy connection
Unable to check large model into SQL Server repository via Proxy
2) You try it with two differents DBMS. It seem your model is "corrupted" when you migrate from 15.3 to 16.5.
Could you try this :
a)
Open in 16.5 your 15.3 model,
click on powerdesigner verify function,
correct errors,
save-it,
re-open in 16.5
check-in your new physical data model
b)
Open in 16.5 your 15.3 model,
Generate logical data model from your physical data model
Delete your physical data model
Generate physical data model from logical data model
save-it,
re-open in 16.5
check-in your new physical data model