Imac can not see fonts on external server

Question

We are a commercial printer. We updated this computer to leopard, then decided to go back because of various issues. one of those issues was that the imac could no longer see fonts on our external file server. the fonts appear to be there, but there was 0K in them according to the imac, and the fonts would not load into our font manager (suitcase). When the files were examined at other work stations, the fonts are indeed there and work just fine.
A related issue, when loading files from cd containing fonts, these files are correct if copied to the imac, but when copied by the imac onto the external server the font files have 0K, and they do NOT work at any other workstation - there really is in this case 0K on the external server.
We have since gone back to OSX 10.4.11 but this problem remains.
This is a serious problem and is rendering this computer unusable for anything but email.

Answer 1

Did the other tries bring back any of the thumbnails? 
If not and the 4th try fails continue with this:
Using iPhoto Library Manager  to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option
In the next  window name the new library and select the location you want it to be placed.
Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments. However, books, calendars, cards and slideshows will be lost. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.