In Captivate 5, when I try to edit closed captions settings in the skin editor my project locks up

I am using Captivate 5 (Windows XP). I cannot edit the closed captions in the skin editor. When I click on Settings, under closed captions, in the skin editor, I see the CC Project Setting box, but no matter what I do, my project locks up (not my computer, just Captivate 5). If I try to change the font size, my mouse turns into a double-headed arrow as I roll over the font size, but once I click, the box disappears and the skin editor window closes, but I still have the double-headed arrow cursor. The only action I can take is to open the skin editor, but if I click on settings, nothing happens. If I close the skin editor, I cannot get it back. The program does not respond at all, I cannot even close it – though my Task Manager does not show it as unresponsive. If I am in the CC Project Setting box and do not attempt to make any chances, but click on either OK or CANCEL, the same thing happens, but my cursor is not a double-headed arrow. This also happens if I create a new project. The only difference is the default font size for new projects is 12 pt, which is okay. The 11 projects I created in earlier versions of Captivate all show a default font size of 8pt, which is too small. Help, I need to increase the font size on all my projects as soon as possible so they are readable!