[impala] Query editor text box misrepresent its focus

Using IE9 on W7, sometimes (can't seem to reliably reproduce it) when an Impala query has completed and results are shown below the query box, the cursor is blinking in the query box as if ready to accept keyboard input, however when then typing non-whitespace characters nothing will register, but strangely at least the backspace, space, and return keys work as normal. Clicking outside the query box and then back into it again brings the query box back to its normal state.