Re: [Resolved] Category Pages Go to White Screen.
Some of things I would do:
– Deactivate all plugins and change theme to default twentyten theme. Clear cache. Run Settings > Permalinks and see if categories are working. Then activate theme and plugins one at a time to determine which one is causing the irregular behavior,
– Could also be that your theme’s archive or category template page has been corrupted. Re-upload the template file/s.