NAV 2013 Development Environment has stopped working

Hello,
I'm sorry, don't understand what you mean "used the merge "feature" from the import worksheet?".

If you mean export table as txt or fob file from old NAV and import this to new NAV, so yes, I try this too (first and also last time).
But new NAV don't know for example "LookUpForm" and was necessary manually change it to "LookUpPage" in the notepad editor But this procedure is not good. Table after import can't open for the same problem (NAV crashed).

So I manually created new table in NAV7, copied all fields from old NAV (ctrl c, ctrl v) and tried compile it. When no error was reported. I again manually (copy, paste) inserted code to new NAV (OnValidate...). Save, compile... All was OK. After I added to the table some test data (no problem, table relation OK, all was OK). And I started with function expansion in the table according old table, and here began problem, because for correct compile was necessary added some function and fields to different tables. So I saved this table without compile, and updated other table. But If I after tried open problematic table for design, problem was on the World.

On the internet I find that this problem was if in the code was more failures -> NAV crashed. But according MS information this should be resolved by hotfix 7.0.34194 (KB 2779775). I tried it but without positive result.

So now, I deleted all data from problematic table direct in SQL, and deleted this table from NAV. And I started again. But now, I never save table without compile. Only if compile check (F11) is without error message.
And all is OK, but this is very limiting. :roll: