The editor completely freezes in the circumstances described below.

The following error is in the logs: SCRIPT16389: Unspecified error. batch.js line 15129 charater 6

Stpes:

1. Insert 3x3 table via the toolbar (important: if the table is inserted via autocomplete, the issue will not happen)
2. Click in the 2nd row, first column
3. Type 1 in the first column,
4. Press right arrow, type 2 in the second column
5. Press right arrow, type 3 in the third column
6. Click remove row in the table toolbar
7. Editor is frozen.

The above doesn't occur in IE9 (though there is some slight caret position quirks).