Eric, could you have a look at
http://kegel.com/wine/valgrind/logs-2008-03-17/vg-riched20_editor-diff.txt
There are several new errors of the sort:
+ Conditional jump or move depends on uninitialised value(s) + at ME_SetParaFormat (para.c:400) + by ME_SetSelectionParaFormat (para.c:436) + by ME_RTFReadHook (editor.c:662) + by RTFGetToken (reader.c:417) + by RTFRead (reader.c:333) + by ME_StreamIn (editor.c:1095) + by RichEditWndProc_common (editor.c:2432) + by RichEditWndProcA (editor.c:3237) + by (within /home/dank/wine-git/dlls/user32/user32.dll.so) + by call_window_proc (winproc.c:457) + by WINPROC_call_window (winproc.c:2207) + by call_window_proc (message.c:1615) + by send_message (message.c:2430) + by SendMessageA (message.c:2575) + by test_EM_SETTEXTMODE (editor.c:471) + by func_editor (editor.c:2705) + by run_test (test.h:406) + by main (test.h:455)