I have heard recordings of Beethoven's C sharp minor string quartet Op. 131 where, in bar 53 the third crotchet of the first violin part is played as E flat, and at least one recording where it is played as E natural. The E flat (or D sharp), combined with the other parts would give the chord B major, while the E natural would give a B suspended 4th, if I'm not mistaken.
(The "E natural" recording I have in mind is by the Taneyev Quartet of Leningrad dated 1988, and is on an LP on the мелодиа (Melodia) label.)
Given the tempo and the prominence of this particular note, it seems highly unlikely to be a `bum note' on the part of the player.
Are there different editions of the score that would account for this? Is there any consensus as to which was Beethoven's true intention?
EDIT: Using the links kindly provided by Carl below, I found one possible source of the E natural, namely the 1863 Breikopf and Haertel edition. Here it appears with the accidental immediately preceding the note. In other editions (including at least one older edition) there is no such accidental, so following the key signature the note is E flat.
So the answer to my first question above is yes. But what is the source of the Breikopf and Haertel natural sign? And which is the composer's likely intention?