First off, version 1.6 is very old. The latest version is 1.7.5. I would recommend updating. This may help with the bumps you are seeing.
Stringing can be minimized by dialing in your retraction settings. Here is our article on how to do that.
Sounds like the application data may have been corrupted somehow. If you were logged into your cloud account before then all your settings are saved online and will be restored when you log in again.
Sounds like we're going to have to do some troubleshooting. Can you send a message to firstname.lastname@example.org?
That option is not available when using MatterSlice as your slice engine. If you need it then you will have to use Slic3r instead.
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