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Sadly, the menu still pops off after about 5 seconds.

Instead of tapping the screen rotate the mode dial from 'manual' to 'A+' that should remove the bootflag and then you can delete the files on the card. You can see the procedure at the end of this video (from 3min 30 seconds). The flash-screen information has changed somewhat with the latest builds - keep a close eye on the bottom of the LCD display after rotating the dial, it will keep you informed of proceedings there.
http://www.youtube.com/watch?v=jc8Zo-VMUkU

I have been using the nightly builds over the past month since getting the 11-22mm lens - all have the shutterbug,
including 2014Apr23.EOSM202

I used to get fairly regular red light hang-ups requiring a battery pull on start-up. No problems with that using
the latest build.