Looks like a follow-up version of the the 3.0 firmware has been released with bugfixes. You should probably update your firmware to 3.01.0 before you start a new topic or post about a 3.0 issue. I don't see a new HX Edit for 3.01.0 yet. This is just a firmware update. At least for the moment. As phil_m posted elsewhere, try using the "Check for updates" link at the bottom of HX Edit to do the firmware upgrade before you resort to using something like the standalone Updater. Worked fine for me.
Just FYI - this firmware bricked my next-to-new Helix. Was on 2.92 decided to patch. Died at 32% into the update, restarted to "boot failed", and it's dead. Have tried both Windows (older Dell, on laptop and in-dock USB ports) and Mac (brand-new Macbook Pro) laptops to recover following all the steps outline in the "hey let's call our users morons" support thread, tried 2 different USB cables, and it's still deader than Vaudeville. In both cases the OS sees the device, but the updater/editor do