I clearly remember these features were working correctly, so it got broken in any recent update.
Visualforce Components (like <c:MyComponent />) are no longer being detected by the Offline Symbol Tables.
This is happening for Custom VF Components only (the standard components, such as apex:pageBlock, etc, seem to be working correctly)
The custom components are always displayed in red color (as if it was mistyped) in all pages.
- Right click in the component and -> Find All References, no longer works
- Right click in the component and -> "Go to Definition", no longer works
- Component's parameters auto-completion is no longer displayed while writing it on a page
- Ctrl + Q (to open component's help), no longer works
Scott: this is an awesome IDE, thank you very much for working on it!