The save icon is not responding to source code is changes until the Studio has initialised the designer.

1. Start the studio and open a workspace
2. Make sure that a source files is open, in code mode and selected
3. Restart the studio and reload the workspace.
4. Make some code changes - the Save icon does not become active.
5. Toggle in and out of designer mode or switch to and from a tab that is in design mode and the save icon will start responding to code changes.