i started to use Sapphire 5830 with phoenix 1.48 a week ago and have no problems
i've downloaded only
Catalyst Software Suite 56.7 MB 11.5 5/9/2011 from
http://www.amd.com/ru/Pages/AMDHomePage.aspx - works fine
ps... thanks to author for great miner!
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Did you have to run anything after it installed? Are you using Windows 7 32 bit? I'm running 64 bit and the only other thing I can think of is just doing a fresh install of Windows 7.