Context: for now I must continue to use 3.4.x as the performance of 4.x is unacceptable.
A bug unique to IE9 recently identified in 3.4.0 was closed with the header inaccurately stating:
"Looks like we can't reproduce the issue or there's a problem in the test case provided."
and the detailed Sencha response:
"This looks to be fixed in Ext JS 4. If you need a fix for you application, you will need to open a ticket at support.sencha.com"
So it appears that if an acknowledged bug has been fixed in v4, it will not be fixed in v3 unless someone opens a ticket. Question: will it be fixed and checked into SVN for 3.4.x if it is fixed on a ticket?