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b. 207

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

..

In FE, a  is only before the top note of the octave on the 2nd beat of the bar. The patent mistake was corrected in the remaining editions by adding a  before the bottom note, whereas in EE and GE3, the unnecessary  before the top note was also removed.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions

b. 207

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

No slur in FE

Slur in GE & EE

..

In FE, the missing slur is most probably an oversight related to the introduction of bass clef to the notation of f​​​​​​​. Anyway, it must be an inaccuracy, which was corrected already in GE and EE.
Distraction of the engraver of FE is proved also by the missing initial fragment of the next slur – it is only its ending in bar 208, on a new line, that was printed. 

category imprint: Differences between sources

issues: EE revisions , Inaccuracies in FE , GE revisions , Uncertain slur continuation

b. 207

composition: Op. 22, Polonaise

 on 4th quaver in FE (→GE1,EE)

between quavers in GE2 (→GE3)

 on 3rd quaver suggested by the editors

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Just like in b. 63, of which the discussed bar is a literal repetition, the  asterisk was placed a quaver too far in FE, which is probably a mistake. 

category imprint: Differences between sources; Editorial revisions

issues: Inaccuracies in FE , GE revisions

b. 207-208

composition: Op. 44, Polonaise in F♯ minor

Grace notes in bars 207-208 in GE1 & FE (→GE), contextual interpretation

Grace notes in bar 208 in GE2

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There are no doubts that the version of GE2 is arbitrary, although it is difficult to say what could have induced the reviser to introduce this change – whether he considered the authentic notation to be wrong, suggesting an improper performance, or whether he considered the change to be of an ordering nature, with no influence on the performance (see the next note).

category imprint: Differences between sources

issues: GE revisions

b. 207

composition: Op. 23, Ballade in G minor

..

We keep here the triplet slur, since it can also influence the articulation, just like the next one. The latter was initially a slur indicating an irregular group (quintuplet), yet Chopin prolonged it, thus giving it a different meaning, probably concerning articulation/motifs.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Triplet slurs