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I haven't seen that error before, but I'm guessing mounted volumes pertains to backups that you've mounted as virtual disks to browse. The simplest solution is probably to just restart your PC, but if you'd rather avoid that, open Reflect, go the Restore tab, and under Restore Task, click the "Detach" option and choose to detach any mounted backups.
In terms of the smiley faces, that's just a consequence of entering a colon followed by a close parens; lots of applications convert certain strings like that into smiley faces. The workaround I guess would be to add a space between the two characters that trigger the smiley.