I got this msg with Clrmame 3.10a when i checked Mame chds:
Wayne Gretzky's 3D Hockey [folder: wg3dh]
chd update needed: wg3dh.chd [SHA1 set | better convert chd to old standard] [found sha1: c12875036487a9324734012e601d1f234d2e783e]

All Chds are converted with chdman 0.77u3 and now tested
with chdman 0.78 they're all fine but Clrmame won't think so.

Why?

Bye yoshizuki

This message appears when you use new (chdman) chds for an old mame version. Be sure you use MAME 77u1, u2, u3 or 78 for the new images. So check if you use the correct binary for your romscans.