I have gone under the Accessibility Tab and increased the Font Scale for the IPTC Caption Field to 140%. Works great when I have my dummy caption in it. When I go to enter the real text it reverts back to the default size. Sort of defeats the purpose of the increased size. To be clear in my caption field I will enter:
17 August 2012: xx in action against XX at Nationals Park in Washington, D.C. where the Washington Nationals defeated the New York Mets, 6-4.
When I replace the first xx with a code replacement value like \w34\, then the whole text field reverts back to the default size.
Running Windows 7 64-bit on an Intel i7 quad processor with 16GB of Memory.