Can't display some sentences in FrameMaker11

[kawatus]

I'm using FrameMaker11, and some sentences aren't displayed even thought they're there.

When I turn up the display magnification to over 160%, it's displayed normally, but in smaller scales only a blank is displayed.

There are no problems with printing.

Is there something wrong with my computer settings, or is there a setting in FM11 that can fix this?

[Bob_Niland]

Is the text completely vanishing, or just getting greeked (shown as gray bar)?

What font, and font type?

Any chance it's a bitmapped font?

What color is applied to the font and the page background?

What is your setting for:

File > Preferences > Greek Screen Text Smaller Than: [ ?? ]

and

File > Preferences > Monitor Size: [ ??" ]

Also, is this in normal Flow A Body text or in a table?

It's not uncommon for text to semi-randomly appear and disappear (just on screen) in tables with shaded cells.