Reproducibility: Always
Environment: Linux Mint 17 64-bit
Without a network connection, Google Web Designer will show blank screen (if first launch) or title screen (on subsequent launches after successful first launch) indefinitely. Either way, the workspace is never displayed.
So Google Web Designer requires to run with a network connection (doesn't need to be Internet connection, a LAN connection will make GWD work again). This is not desirable as this tool should be able to work offline for most features.
Hendy