More info: I hope this helps someone to figure this out.
I use WinXP Home, 2Ghz P4 chip, 768 MB RAM, 32MB allocated to SiS graphics card. Browser is IE6 but I did recently uninstall MSN Explorer 9 when I switched to DSL from dial-up. All drivers have been updated. This problem existed before AND after updating drivers and switching to broadband.
The uninstall of StyleXP, a desktop theme manager, may have been the cause but I can't be sure. So far, the problem is limited to solely to the avast! On-Access custom settings. No other programs are affected. Also, even though the text is blacked out, avast! can still read the settings correctly.
No, changing the color settings of Windows doesn't do anything. I even changed the color profile used by my LCD monitor with no effect.
Please don't give up on this guys; I really like avast! but want everything to work right. I primarily use the Normal or High settings anyway, but don't want to limit myself. Thanks, KD