Miranda 0.7.7 unicode is not compatible with riched20.dll version 5.0.152.0 (richedit 2.0, not 3.0)
In upper part of message window there is only an image of red double arrow, no text at all.

Older version (Miranda 0.4.0.1) was compatible with this dll.
Miranda 0.7.7 ansi seems working well.

System is win2k with older version of riched20.dll