As ports are now locked, I decided to give a try with the new snapshot to report if the problem still persists.
OpenBSD 5.4 (GENERIC) #31: Sun Jul 21 19:11:18 MDT 2013 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC Everything back to normal and suspend resume is working like a charm after testing as many times as I could during the day. -- [demime 1.01d removed an attachment of type application/pgp-signature]