I was told this was noticed in the past and someone found a local fix for it, but I couldn't find it in the JIRA issues, so I'm going to refile this.

I have a Kepler instance which is working fine. I installed STS 3.6.4, which is Luna. I have them configured just about the same, as much as possible, with the same plugins.

At some point I discovered that some key bindings in my Groovy views were missing, like "quick outline", "go to line", and "next word". I first noticed this with "quick outline", and I think it's likely that others besides those other two are missing.

It isn't just that the bindings went missing. I tried to readd the binding for "quick outline", and it just doesn't work. I even brought up both Eclipse instances side by side (connected to different workspaces), and the "Quick Outline" function in "Keys" is bound exactly the same in both.

I also have the Emacs+ plugin in both instances. Using this, I can directly execute these unbound functions. Running "go-to-line" and "next-word" works fine, but when I execute "quick-outline", I see the dialog appear and disappear in a fraction of a second.

Although I can't get to "quick-outline", the normal outline view appears to render fine, and when I double-click on an entry in that, the editor view goes to that symbol.

When I view a Java file in the Luna instance, the behavior is similar, but slightly different. When I press Ctrl+o, I see a little box show up in the bottom right-hand corner of the Eclipse window that just shows "Quick Outline Ctrl+O". This is the box that shows up when I press the beginning of a key sequence where there are multiple possible sequences that start with that sequence.

When I do this in the Java view, I also saw log entries appear that are definitely relevant, but I can't fully interpret them. I'll include the entire log, but this is the relevant excerpt:

!MESSAGE A conflict occurred for CTRL+O:
Binding(CTRL+O,
ParameterizedCommand(Command(org.eclipse.mylyn.task.ui.editor.QuickOutline,Quick Outline,
Show the quick outline for the editor input,
Category(org.eclipse.mylyn.tasks.ui.commands,Task Repositories,null,true),
org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@7b3d759f,
,,true),null),
org.eclipse.ui.defaultAcceleratorConfiguration,
org.eclipse.jdt.ui.javaEditorScope,,,user)
Binding(CTRL+O,
ParameterizedCommand(Command(org.eclipse.pde.ui.quickOutline,Quick Outline,
Open a quick outline popup dialog for a given editor input,
Category(org.eclipse.ui.category.navigate,Navigate,null,true),
org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@a4479f1,
,,true),null),
org.eclipse.ui.defaultAcceleratorConfiguration,
org.eclipse.jdt.ui.javaEditorScope,,,user)
Binding(CTRL+O,
ParameterizedCommand(Command(org.eclipse.wst.jsdt.ui.edit.text.java.show.outline,Quick Outline,
Show the quick outline for the editor input,
Category(org.eclipse.ui.category.navigate,Navigate,null,true),
org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@73b1c6d9,
,,true),null),
org.eclipse.ui.defaultAcceleratorConfiguration,
org.eclipse.jdt.ui.javaEditorScope,,,user)
Binding(CTRL+O,
ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.show.outline,Quick Outline,
Show the quick outline for the editor input,
Category(org.eclipse.ui.category.navigate,Navigate,null,true),
org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@1e1634fa,
,,true),null),
org.eclipse.ui.defaultAcceleratorConfiguration,
org.eclipse.jdt.ui.javaEditorScope,,,user)
Binding(CTRL+O,
ParameterizedCommand(Command(org.eclipse.wst.sse.ui.quick_outline,Quick Outline,
Show the quick outline for the editor input,
Category(org.eclipse.ui.category.navigate,Navigate,null,true),
org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@7c94a0dc,
,,true),null),
org.eclipse.ui.defaultAcceleratorConfiguration,

org.eclipse.jdt.ui.javaEditorScope,,,user)

I decided to try to reset my keys to default bindings. This actually fixed Ctrl+o in my Java view. The Groovy view still doesn't respond to either of the three commands I was focusing on, and executing "quick-outline" directly in EITHER view makes the dialog appear and disappear in a fraction of a second. I suppose the fact that this last behavior also happens in the Java view, where the regular Ctrl+o press works fine, tells me that the quick appearance and disappearance has something to do with executing the function manually, as opposed to with a keypress.

I also note the following log entries:

!ENTRY org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Warnings while parsing the key bindings from the 'org.eclipse.ui.commands' extension point
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.springframework.ide.eclipse.beans.ui', id='org.springframework.ide.eclipse.beans.ui.inplace.show'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.springframework.ide.eclipse.boot.launch', id='org.springsource.ide.eclipse.boot.BootLaunchShortcut.run'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.springframework.ide.eclipse.boot.launch', id='org.springsource.ide.eclipse.boot.BootLaunchShortcut.debug'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.springsource.ide.eclipse.gradle.ui', id='org.springsource.ide.eclipse.gradle.ui.refresh.all'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.refactoring', id='org.codehaus.groovy.eclipse.refactoring.command.inlineMethod'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.refactoring', id='org.codehaus.groovy.eclipse.refactoring.command.inlineMethod'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.791
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.refactoring', id='org.codehaus.groovy.eclipse.refactoring.command.rename'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.792
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.refactoring', id='org.codehaus.groovy.eclipse.refactoring.command.rename'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.792
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.ui', id='org.codehaus.groovy.eclipse.groovyScriptLaunchShortcut.run'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.792
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.ui', id='org.codehaus.groovy.eclipse.groovyScriptLaunchShortcut.debug'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.792
!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.ui', id='org.codehaus.groovy.eclipse.ui.convertToMethod'
!SUBENTRY 1 org.eclipse.ui 2 0 2015-04-05 14:31:24.792

!MESSAGE Cannot bind to an undefined command: plug-in='org.codehaus.groovy.eclipse.ui', id='org.codehaus.groovy.eclipse.ui.convertToClosure'