Issues : Omission of current key accidentals

b. 615

composition: Op. 11, Concerto in E minor, Mvt I

..

In FE (→GE1GE2, →EE1EE2), there is no accidental before the penultimate semiquaver. The undoubtedly necessary ​​​​​​​ was added only just in GE3 and EE3.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Errors repeated in GE , Errors repeated in EE

b. 636

composition: Op. 11, Concerto in E minor, Mvt I

..

A sharp raising c2 to c​​​​​​​2 appears in FE (→GE1GE2,→EE1EE2) only just before the 4th quaver of the bottom voice. Chopin would write an accidental too late on a few occasions (e.g. in the Etude in F Major, Op. 10 No. 8, bar 43). An accidental at the beginning of the bar was added in EE3 and GE3, yet it was only GE3 that removed the  in the middle of the bar, unnecessary in this situation.  

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , GE revisions , Omission of current key accidentals

b. 649-650

composition: Op. 11, Concerto in E minor, Mvt I

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In FE, there are no sharps raising g2 to g2 (in both bars) and c3 to c​​​​​​​3 (in bar 649). In GE1 (→GE2), the first two were added; the notation in EE and GE3 is fully correct.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , Omission of current key accidentals

b. 657

composition: Op. 31, Scherzo in B♭ minor

 without  in A (→FEEE) & GE2 (→GE3)

with [] suggested by the editors

No  in FC (→GE1)

..

The missing  in FC (→GE1) is most probably an oversight of the copyist (in b. 206, of which the discussed bar is an exact repetition, added in GE2 (→GE3).
The missing  over the mordent must be an inaccuracy of Chopin: see b. 74.

category imprint: Interpretations within context; Editorial revisions

issues: GE revisions , Omission of current key accidentals