Problems with Find and Filter selected text

We recently had all the developers in our shop start using WDSCi version
5.1.0.2.  One of the developers is having problems with the Find and the
Filter functions on selected text. None of the other developers have
reported a similar problem.

Here are the specific behaviors:

1. Select text, then right-click and choose Selected > Filter selection.
Only the line on which the text was selected (the current line) shows up in
the filtered view.

2. Select text, then right-click and choose Selected > Find selection. The
cursor remains on the current line (no change) and the word "wrapped"
appears in the LPEX editor message line.

3. Press CTL-F to get the Find dialog, enter text such as "MY-STORAGE-AREA"
in the textbox, and click the Next button. The cursor remains on the current
line and the following message appears in the LPEX editor message line:
        "MY-STORAGE-AREA" Not Found

4. Press CTL-F to get the Find dialog, enter text such as "MY-STORAGE-AREA"
in the textbox, and click the All button. The filtered view is completely
blank-no lines of code show up at all.

The standard filter views work okay. Right-click, choose Filter view >
Comments (or Divisions or Outline) all work fine.

Any ideas on what might be causing this or how to fix it? 

Thanks,
Kelly