Welcome to Mint thetoolmandar
As you can use Brasero and others there is no "major error" I would expect that a setting has been changed in K3B
If not try to reinstall it....
It is very hard, not to say impossible, to tell what's happened without a hands on approach in a situation like this....
K3B not recognizing any digital devices...
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Before you post read how to get help. Topics in this forum are automatically closed 6 months after creation.