i don't see that problem.
create a new fla. add a textfield, assign text and your trace() function. any difference when you change publish settings?
if yes, zip and attach your fla.
if no, make the textfield and text more and more like your current problematic textfield until you isolate the problem's cause.
p.s. watch for components, that may or may not be related to your textfield, causing the problem.
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flash 6 measures from the left side of the textfield to the right-most text. flash 7 and above measure from the left side of the text to the right-most text.