I have been noticing this warning and error message in my console after updating Chrome to 36.0.1985.125.
'Range.detach' is now a no-op, as per DOM (http://dom.spec.whatwg.org/#dom-range-detach).
Discontiguous selection is not supported.
I'm still trying to decide what to do about this. See this Rangy issue (migration to GitHub not quite complete, sorry). I think it's unhelpful behaviour on the part of Chrome and would like it removed.
The offending code in Rangy is in a feature test that determines whether the browser supports multiple ranges within a selection (of the current mainstream browsers, only Firefox does). Since this doesn't seem to be going away I think I'm going to have to suck it up and add a browser sniff, which makes me sad.
I added a horrible browser sniff to Rangy and the error no longer appears.
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