One thing I noticed on my 13" Haswell rMBP is, When I hit the X to close a tab in Safari, I sometimes have to click on another tap or in the window of the tab (if that makes sense), in order to close the tab by hitting the X. Is this Safari, Mavericks, or an issue with scaling? I have my rMBP scaled to 1024 x 640, the EFI patch is installed, and the rMBP's software is up to date. Anyone else notice this? Super annoying.