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I updated to Live 9.5 recently, and now the Base Scripts are not appearing among the control surface options in Live's MIDI Sync preferences. Actually, the Base M4L script shows up, but not the Base script or the Base LE. I deleted my existing scripts from Livid and downloaded the most recent version of them, then re-installed. This didn't change anything. I've double-checked Live's MIDI Remote Scripts folder and the Base and Base-LE folders are where they should be. Live does detect the Base hardware and I can manually map controls. Just can't load the script.
Using Base 01, with firmware updated and default setting just reset using the online editor. Ableton Live 9.5, Mac OS X 10.10.3 Yosemite.