Pentaho 4.8 Report Analyzer does not work in IE9

Hi,

I have a problem with pentaho analyzer report and Internet explorer 9.
Instruction manual for pentaho 4.8 states that they support IE8 and 9.

Unfortunately when we ran it, it JS errors appear.
------------------------------------------------------------------------------------------
Message: DOM Exception: INVALID_CHARACTER_ERR (5)
Line: 6401
Char: 19
Code: 0
URI: https://[address here]/report/mantle/69565E906E6CF1EC510E658BA8ACF06C.cache.html
------------------------------------------------------------------------------------------

It seems that pentaho 4.8 is built on gwt version 2.0.3 which actually does not support IE9.
It is because JS method createElement which cannot accept full tag of html to create, it accepts only type.
So it is now .createElement("<BUTTON type='button'><\/BUTTON>") while should be .createElement("BUTTON") and then set all properties on created object.

Of course I can add meta tag
<meta http-equiv="X-UA-Compatible" content="IE=5" />but it works only for value IE=5! Compatibility mode for IE 8,7 or 6 behaves the same.
Even if this tag is added pentaho report analyzer behaves unstable and some functionalities does not work and look very ugly (e.g. clicking on properties - grey screen appears, input with property is not in proper place and I cannot enter value there)
But still this is not a solution, I use pentaho as application within iframe and I cannot allow myself to add such metatag for whole application. Adding it within iFrame does not work at all.

Can anyone encountered such issue? Or maybe has a clue for some workarounds?
Thanks in advance
regards
Lukas