I've got a strange problem with my new installation.  (This is my first attempt at an SVN installation.)

The Topic Text window shows no text from the diff in the side-by-side windows.  Instead, the only thing there is a link to the main page, something like this:

Line 173 | Parallel                               Line 173 | Parallel
173                                                    173
174                                                    174  Codestriker 1.9.6 - Topic Details
175   Codestriker 1.9.6 - Topic Details  175
176                                                    176
177                                                    177
178                                                    178  Codestriker 1.9.6 - Topic Details

And, yes, the links do take you back to the main Topic List page. 

I've checked:
- uploaded text diff in the db, looks good
- viewvc URL in conf, looks good
- alias in Apache conf, looks good

If I view page source, the .css URLs look OK.  I don't know what to look for. 

Any ideas?