I had strange issues with 3.01 yesterday. It turned out that switching on certain features of devhook on the first run of devhook (No-UMD specifically) would stop certain things from working.
I had to clean install it all, run devhook, exit, start devhook, switch on no-umd for it to all work nicely.
I dunno if that helps you any in this situation...might be a similar scenario though
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