After upgrading to 1.3.26 I encountered those two issues in Word 2007 and Powerpoint 2007: Word and Powerpoint 2007: window background is striped http://bugs.winehq.org/show_bug.cgi?id=27989 Powerpoint 2007/2010: color & resizing issues http://bugs.winehq.org/show_bug.cgi?id=28034 Those issues already have patches that solve them, I kindly request the inclusion of those patches in portage for 1.3.26 version (a new revision?).
the patches havent been merged yet. when they are, we'll get them with the next release. in the mean time, you can easily put the patches into /etc/portage/app-emulation/wine/ and have them auto-applied when you emerge wine.