If you use the Custom SQL tab in a DataManager Database source block, then whenever you click on the "Edit SQL" tab, it invalidates the data and forces a reload. It would be useful to have a way to view the custom SQL that has been used without forcing the reload.
Thanks for the comment. I'm unable to reproduce what your describing. Here's what I did:
1. I created a database source block in DataManager. 2. I clicked "Custom SQL" and entered a custom SQL statement. 3. I clicked on the Edit SQL tab. This did not invalidate the block and force a reload as described.
Is this the same set of steps your going through? If so would it be possible to arrange a screen-sharing session with us to demonstrate this issue?