Cant allow app to control computer anymore

I'm developing app now, and when I debug it - I open debug folder and drag app into Preferences->Privacy->Accessibility->List. When I want to show demo, I drag this app to applications folder and remove old app from accessibility and add new one from applications.

Today I can't drag nor add by + this app.

So, I open console. Drag again - nothing. Add via +, see next messages:

25/12/14 16:27:21,228 WindowServer[143]: window 103 is already attached to window a0 
25/12/14 16:27:21,824 WindowServer[143]: window 103 is already attached to window a0
25/12/14 16:27:21,837 WindowServer[143]: window 103 is already attached to window a0
25/12/14 16:27:23,602 com.apple.xpc.launchd[1]: (com.apple.quicklook[868]) Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook
25/12/14 16:27:25,072 WindowServer[143]: _CGXGetWindowOrderingGroup: Operation on a window 0x103 requiring rights 0x5 by caller System Preferences

In accessibility I already have Automator, Script editor (not checked), Xcode (probably they was meaned in first three lines).

I worry about last one - have no idea what it talks about? Are my rights has been gone somehow? Funny, but I am able to add any other product to that list...