I’ve just got a pair of 29er SID XX (not world cup ones) and before I took delivery had read various threads about the XLoc needing bleeding.
I tested them last night and if I have the gate adjuster turned all the way to + then the only way I can unlock the forks is to hold the XLoc button right in with my thumb, as soon as I release the forks lock even though the XLoc button is still depressed.
Adjusting the gate control towards – sorts this out and the forks then operate correctly even after I let go of the button.
So I’m guessing mine need a bleed too, so seems like a common ‘issue’