Same here. With interladed PAL projects everything's OK, but with 25p I can capture only when capture window is black. Video card is supported.
My guess that faulty is CMAvidDVCodec.avx file under AVX_Plugins. This file seems completely different compared older versions and not replaceable like in pre-5.5 XPressProHD versions when green line on top of the QT exports was a problem.
By the way...this file is exactly the same in XPress 5.5.3 and Media Composer 2.5.3
Both have problems with progressive capturing.
Maybe I'm wrong...