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I believe I've figured out the issue with 1.12 not launching. I'm currently assuming only people who play the game through Desura's client have the issue, so let me know if that's not the case. Will update it now.
In the meantime, if you're having trouble and want to play right away, go to your Program Files\Desura folder. Find Common\Inferno. Delete Inferno.exe. Then rename Inferno+.exe to Inferno.exe and Inferno+_Data to Inferno_Data.
Did you guys uninstall the original version first? If not, try that.
Trying to track down the problem.
You're right, it's just setting a flag for that level that causes the bug, not the achievement triggering. Will get a fixed build out this week.
Are you guys playing on Volcanic? I think I may have found a bug that prevents that causes a crash when the Finish All 40 Levels - Volcanic achievement tries to complete. If that's the issue, switch to Hot/Warm in the pause menu and finish the game, then New Game+ will unlock. I'll update the PC/Mac version soon with a fix.
I'll make it so as soon as I can, but it'll be a couple months at least.
Yes, controls are full-customizable, including both relative and absolute mouse aiming (and 3 sensitivity levels).
To fix the savegame issue and preserve your previous save data when updating:
Copy SuperCrossfireData.txt from "AppData\LocalLow\Chillingo\Super Crossfire" in your user directory (example C:\Users\Luke\AppData\LocalLow\Chillingo\Super Crossfire\SuperCrossfireData.txt) to AppData\LocalLow\Radiangames\Super Crossfire.
Note the Radiangames instead of Chillingo. Obviously I should have caught the issue in testing and I'll be sure it doesn't happen again.
FYI: It appears updating the game has caused someone to lose data, so be careful updating the game. I'll update when I know more about it and how to fix/work around the issue.