Says that command option f is a system shortcut that opens spotlight search in Finder. So even if you're not running 'Shift-It', the Sublime shortcut doesn't work. This is my case in El Capitan. I personally use 'Replace' much more often in Sublime than Spotlight search, so I mapped the Finder keyboard shortcut to something else: control+option+command+f. Now sublime works as expected.
To disable the system keyboard shortcut, open Preferences, Keyboard and click Shortcuts. Select 'Spotlight' from the list on the left.
This version of ShiftIt is currently depreciated, however, another developer picked up the development of this utility. There isn't any sort of affiliation between the two projects, except for the use of the idea, code, and icons. ShiftIt, though a little buggy, is a great utility to have installed on your machine. In order to help to improve ShiftIt, please submit an issue every time you find some weird behavior. Before you do please consult the list of known problems. ShiftIt wants accessibility access on my Mac but my system preferences don't match the instruction, why? For instructions on accessibility in Mac OS X 10.9.x, see this comment.
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Select 'Show Finder search window' in the list on the right and press control+option+command+f to set the new shortcut. You also have the option of unchecking the system shortcut to disable it. Powered by, best viewed with JavaScript enabled.