(cur | prev) 08:56, 29 January 2013 Σ (t | c) . . (1,161 bytes) (+1,161) . . (pagetriage-del-talk-page-notify-summary: Parse error at position 44 in input: Notifying author of deletion nomination for $1)
There were a few other edits that Σ made which had the same broken edit summary.
His browser/OS info:
"Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1"