Toolbar SAVE icon (and toolbar/File/Save) are always grayed out .. even after running a query and seeing the results.
The SAVE ALL is available, but it does nothing when it is selected.
For this last install, I deleted all SQL developer references, including the previously installed folders from my C Drive,
and info in the C:/AppData/Roaming/ sub folders for SD.
using SD Version 220.127.116.11, Windows 7, 64 bit machine