I do have some problem regarding saving changes when I'm going to modify my table. I'm using user defined default in my fields. I'm wondering that the reason why I can't modify my table because I'm using user defined default. When click the save button I always encounter this error message
There's an option in SQL Server Management Studio to prevent you from doing changes that require a table to be rebuilt from scratch.
Go under Tools > Options > Designers
and find the checkbox Prevent saving changes that require table re-creation
and uncheck that checkbox.
It's not a bug - it's a feature! :-)