Do you have an entity list and more details about how you got the curse? When you die, the curse should certainly disappear forever...
Not a HEE bug, READ.
Macs have occasionally issues with java updates, try googling the solution. There should be some tutorial on how to fix that on AT Launcher website iirc.
You need a pickaxe that has same level as Diamond Pickaxe or better. If you can't get that, you're out of luck.
If you destroyed the crystals, the dragon can't heal at all.
The title says all, but the report is invalid because you haven't provided any information whatsoever.
I can't, ID conflicts have to be resolved by the user.
License information is in the MCForum topic, link on main page.
If just the game freezes, you don't need to restart the computer... You also didn't provide pretty much any information, so if blowing up beds works fine for me and isn't just some bug in latest version, I can't do anything about it.
You don't combine them, you add more effects to enhanced pearls ;).