Can't see classes

[Andrew Prior]

Hi folks.
I have several sites under CMS Made Simple 1.2.3 "Black Rock"

in each of these I have the following code in the Layout: Top Menu + 2 Columns Styesheet:

/* relational links under content */
.picborder {
margin: 3px 10px 10px 10px;
}

div.left49 {
  float: left;
  width: 49%;  /* 50% for both left and right might lead to rounding error on some browser */
}

div.right49 {
  float: right;
  width: 49%;
  text-align: right;
}

In only one of the sites, when I go to choose the class when editing I cannot see any of these three.  Does anyone have any clue where I should start looking for the problem?  The stylesheets seem identical in each case.

On the errant site, if I go into the html code and manually place class="picborder" in the parameters for an image, the paramenter is applied and works.  But it does not show up in the gui editor. Indeed, if I open an image with the image icon in the editor and then update, the picborder reference is removed.

TIA