It isn't a bug, it just isn't right Db minor is C# minor. So the key sig is 4#'s. Just because something might work in theory it doesn't make it right in practice. You just don't write in FbMaj/DbMinor, it's E and C#.

Pretty basic music theory really. Check out any circle of fifths diagrams.

Chris..

btw

Two of Verdi's most well-known operas, La traviata and Rigoletto, unusually, both end very decisively in D♭ minor. For clarity and simplicity, however, D♭ minor is usually notated as its enharmonic equivalent of C♯ minor.

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