Hi Patricio,
The Text Recognition feature creates a separate object for
every call to system text drawing functions. You can find more information on
this in the 'Specifics of the Text Recognition Technology' section of the 'Text
Recognition Technology Support' help topic
(http://www.automatedqa.com/support/viewarticle.aspx?aid=2711).
So, it seems that the controls containing the text you need
to read behave differently on these two systems and calls system functions
different number of times. Could you please install the SP3 to one of the
machines with SP2 and check whether this is the cause of this behavior?