Text color problem in nested album descriptions in IE6

I have been using Gallery 1.5, with the bblue skin, for about a year with no problems. All of a sudden, now when I add a new nested album, the desciption shows up in dark gray on black, instead of light gray on black. When you mouseover the link, it turns to light gray. All nested albums previously created are light gray all the time.

The odd thing is that this only happens on some computers. It happens on 2 out of 4 computers here with IE6 (all have same version). It does not happen in Firefox. Nothing has changed recently in the gallery configuration.

Does anyone know if a Windows update could have caused this? Or if there is some other problem?

Thanks for any help.