ASSERTION FAILED: [_targetView window]
(Users/matt/Code/WebKit/WebKit/WebInspector/WebNodeHighlight.m:251 -[WebNodeHighlight(FileInternal) _repositionHighlightWindow])
1. Open Safari and load a site
2. Open the Inspector and dock it to the window
3. Open a new tab
4. Resize the window
5. Assert -> *BOOM*
This will be fixed once bug 14254 is fixed.
*** Bug 15349 has been marked as a duplicate of this bug. ***
You also hit this assert if you have the inspector open and just open a new tab (if it's your first new tab and you have the tab bar hidden).
A lot of work has been done in this area and I can no loner reproduce. can you please verify if this is fixed.