Since this caught me a little by surprise, it probably will catch someone else. Here’s a tip: The shortcut key for the “OK” button is:
When on the commit dialog, I often only use the keyboard. I try to stay away from the mouse as much as possible. I type the commit message, toggle ALT+A for selecting all files that were chanted (to get non-versioned files as well), and then I was so used to hitting ALT+O because the “O” in “OK” was a hot letter.
I upgraded to TortoiseSVN 1.6.2, and ALT+O didn’t work anymore. It may have been in the release notes, who knows, but I found out, quite by accident that CTRL+ENTER keeps my fingers on the keyboard. I’m sure one of you commenting will let me know that this is some old, universally-known truth, but it’s news to me. In case it helps someone else, here it is. . . and here is the version of TortoiseSVN I’m on now.