It was using IE at work.

Even looking at it at home here, the text box is smaller when replying to a PM than it is replying to a post on the forums.

using IE 8 at home too.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.