Out of curiosity, would the SSE4 only using SSE2 instructions be considered a bug or feature?  Because having two things that do exactly the same thing is sort of a problem.

I'm trying to tell you it will work... just redirect 2>filename.txt instead of >filename.txt

eg: no log
./cgminer -o blah -u blah -p blah

with log
./cgminer -o blah -u blah -p blah 2>filename.txt

Yep, that's one dodgy driver. I've reproduced it.

I haven't been able to find one. It appears to really be a driver bug.

It says "Satan <3 U", but it's too fast for the human eye to perceive...

On WinXP, pressing q leads to an error report being generated.  This may be related to the hang in Win7, as in WinXP there is less security, and my firewall indicates that cgminer.exe interacts with dwwin.exe (Dr. Watson Windows) to generate that report.  I don't actually use cgminer in Windows because of the high CPU usage, though.  I'm only reporting this in case it helps with the aforementioned Win7 issue.

I see quite a lot of rejects from the cpu. So it means that in a few hours it did find something

New release 1.5.2:

Source:
http://ck.kolivas.org/apps/cgminer/cgminer-1.5.2.tar.bz2

Linux x86_64 binary:
http://ck.kolivas.org/apps/cgminer/cgminer-1.5.2-x86_64-built.tar.bz2

Windows binary delayed!


Changes:

- Restarting a hung GPU can hang the rest of the GPUs so just declare it dead
and provide the information in the status.
- The work length in the miner thread gets smaller but doesn't get bigger if
it's under 1 second.     This could end up leading to CPU under-utilisation and
lower and lower hash rates.     Fix it by increasing work length if it drops
under 1 second.
- Make the "quiet" mode still update the status and display errors, and add a
new --real-quiet option which disables all output and can be set once while
running.
- Update utility and efficiency figures when displaying them.
- Some Intel HD graphics support the opencl commands but return errors since
they don't support opencl. Don't fail with them, just provide a warning and
disable GPU mining.
- Add http:// if it's not explicitly set for URL entries.
- Log to the output file at any time with warnings and errors, instead of just
when verbose mode is on.
- Display the correct current hash as per blockexplorer, truncated to 16
characters, with just the time.

I'm assuming ncurses isn't used in text mode.  That said, if you really want to switch over from Diablo today, use -T (IOW, while the issue still needed reported, I don't think it should prevent you from switching if you so desire)..