I have the same problem. I tried Crimson when it first came out, got the "Radeon Settings: Host Application has stopped working" error soon after installing. Decided to go back to Catalyst GUI (but still use Crimson drivers) because Catalyst had more advanced options. That worked well for awhile. But now that most of the advanced features in Catalyst don't work anymore with the last few driver versions I decided to go back to Crimson GUI. I got the "Radeon Settings: Host Application has stopped working" error a few minutes after rebooting from the install. Although I can restart Radeon Settings and it works fine and hasn't crashed again so far.
If you disable the option to display system tray icon does the problem still occur? There's another post about this Radeon Setting Has Stopped . It's possible some program or background process is conflicting with Crimson. Maybe you should try disabling all unnecessary programs and their associated services then slowly enable them one by one to see which one might be causing it. I might have to try this too if it starts crashing on me constantly. So far it's only crashed on me once when I logged into Windows but I restarted Radeon Settings and everything has been fine.
I'm using 280X and Win 7 64bit.
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If everyone reports it to AMD, then there is a chance for a fix. Posting on a forum is not a report.