I just wanted to say everything seems to be working well on my end. Turned off the 1.0.6 server. Erased configs, mods & coremods, added the 1.5.1 versions, updated to the latest recommend build for MCPC+, updated all the plugins with Minecraft 1.5.2 compatible versions, started it without fail. People coming and going as they please, no broken worlds.
Thanks for the update CanVox.