Can't share anything via Messages
the following is the Console log from one of many recent attempts to share anything (contacts, web pages, etc) using button that should push item to messages mini-window. Who can decipher the issue here?
4/24/15 1:15:07.698 PM pkd[292]: enabling pid=666 for plug-in com.apple.share.Messages.compose(329) 16355A99-6135-4360-9D2C-75D6AD7BAF7B /System/Library/PrivateFrameworks/ShareKit.framework/Versions/A/PlugIns/ShareMe ssages.appex
4/24/15 1:15:08.129 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
4/24/15 1:15:08.537 PM ShareMessages[721]: SACShieldWindowShowing:925: ERROR: NULL response
4/24/15 1:15:14.725 PM sandboxd[285]: ([721]) ShareMessages(721) deny mach-lookup com.apple.logind
4/24/15 1:15:18.540 PM Contacts[666]: plugin com.apple.share.Messages.compose interrupted
4/24/15 1:15:18.541 PM Contacts[666]: error with remoteObjectProxyWithErrorHandler: Error Domain=NSCocoaErrorDomain Code=4099 "Couldn’t communicate with a helper application." (The connection from pid 721 was invalidated.) UserInfo=0x60800287b380 {NSDebugDescription=The connection from pid 721 was invalidated.}
4/24/15 1:15:18.545 PM com.apple.xpc.launchd[1]: (com.apple.share.Messages.compose[721]) Service exited due to signal: Killed: 9
iMac, OS X Yosemite (10.10.2)