It sounds like the import wizard did not run as expected, which was a bug in 1.6 that was fixed in 1.6.1.

Delete the Profiles folder found at C:\Users\$USERNAME$\AppData\Local\MatterControl\Profiles (AppData may be hidden by default) and relaunch 1.6.1.

This time the import wizard should run and you'll be able to import all the settings and profiles from before the upgrade. Once you have those I suspect that slicing will work as you expect.

Good catch. We made some major changes to the way support material works in 1.5, and that got removed by accident. This will be fixed soon.

Is possible problem in query and read string(bed_size) to table "SliceSettings" base "MatterControl.db".

Since it is a Windows computer....have you tried it after rebooting your laptop?