After all the glowing reviews on this board, I am ashamed to say I thought his playing had lots of problems...but perhaps it was just this specific repertoire. Lots of big mistakes, sloppiness, and even a passage in the Rachmaninoff that didn't come out at all....
What can I say? Nothing to be ashamed of.
Sh*t happens.
I myself witnessed when Gilels was playing Waldstein and desperately could not get his hands playing together sixteenths.
I myself witnessed when Gilels was playing Schumann Symphonic Etudes, when there was literally no one single page without a few mistakes, including some terrible memory slips. I am not even talking about one of his Brahms-Paganini rendition

.
I myself witnessed G. Sokolov completely screwing up Chopin Etude Op.25/11 (for a record, when Sokolov is in shape, nobody in the word has EVER played this etude like him).
Friend of mine has witnessed Richter playing HammerKlavier.
Richter started, the concert, got through first couple pages, forgot and stopped. After a half a minute of torturing pause he got up and went backstage. In ten minutes the concert was cancelled.
Or look at the Horowitz's Japan tour...
I guess, the real artists should be judged by their achievments, and not by their failures.
Best, M