Problem making selection in Quick Mask

Hello,

I hope someone can help me figure out what happened here...!

I'd been working on some photos, selecting various parts in Quick Mask with
the paintbrush. Everything was going great until I went to the next area I
wanted to select and now I get no indication that I'm selecting anything.
What's supposed to happen is that selected areas turn red as you paint them
in QMask. For some reason, this stopped happening. I tried everything:
closed and then re-opened the file, opened a new file...even uninstalled and
then re-installed Photoshop 7 but no joy.

I "think" I may have hit the mouse at one point but don't know what it could
have been on to have caused this. If anyone can help, you'll have my eternal
gratitude!

Thanks,

 

Hello,

Just a guess, but have you changed the foreground color to white, which will
unselect areas. You can quickly change foreground and background colors by
pressing X on the keyboard.

Geoff.