It might just be my ignorance, but I'm not familiar with a MCPC+ #244 build. This is the version I'm using:
mcpc-plus-legacy-1.4.7-R1.1-SNAPSHOT-f534-L70.jar
MD5 Sum: 96ffb259dc6efbcd06c8eb766af1de3a
I believe versions prior to this have a flaw in the way session validation happens which allows someone using a particular hacked client to connect as any user. Every since I updated to that version we never had any more issues of that sort. Even though I believe the flaw to be fixed, I still require any player over the rank of Veteran to use the LoginSecurity Bukkit plugin for a second form of protection.
