I just discovered a tiny, free program that strips all the font formatting out of clipboard text. Text will paste into the LiveCycle text block with no formatting and thus inherit the text block's formatting.
http://stevemiller.net/puretext/
All you do is paste with Windows-V instead of Ctl-V. The hot key to paste can be changed.
Of course, having LiveCycle do the same thing would be the best solution.
Wendell