Malformed Signatures?

Reason Number 7 why I knew i wouldn't cozy to PGP 2.6 - After tinkering around, I decided to see what would happen if I implemented PGP 2.6 using my existing 2.3a keyrings. After performimg a "pgp -kc paul" PGP 2.6 declares my signatories: (Malformed or obsolete signature format) and asks if I would like it to: Remove bad signatures (Y/n)? Does this mean what I think it means? - paul just a tad miffed