Hello, I just noticed that org-babel-tangle removes the comma if its at the beginning of a line inside a source block. This seems to be independent from the language indicated (tried with sh, js and emacs-lisp) and also independent from the characters that follow (',' gets tangled to a blank line, ',,,' gets tangled to ',,', ',sometext' gets tangled to 'sometext' etc.).
Best, Simon Emacs : GNU Emacs 24.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.6.4) of 2013-01-20 on eric Package: Org-mode version 7.9.3e (7.9.3e-1122-g27da9a @ mixed installation! ~/.emacs.d/el-get/org-mode/contrib/lisp/ and ~/.emacs.d/el-get/org-mode/lisp/)