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Hi, it sems it is not a completely black white page (which sometimes can happen in xoops if a script is not working or is stopped early) but no links are displaying when a category is clicked.
First thing to do is go into your admin panel and activate php debug, go to your links page, click a category and copy any errors that you see and post them on here.
Also have you updated any templates or anything like that? if you have try clearing the templates cache, clear browser cache and try the links again.