WP/BP versions? Did you just upgrade to WP 3.1 and/or BP 1.2.8?
What theme are you using – custom BP theme, WP theme with BP template pack, or child theme of bp-default theme?
Need more info to troubleshoot.
Hey!
I am using Wp 3.1 and Bp 1.2.8 .
I am using Platform Pro Child Theme with Bp Template Pack.
I can pm you login details if need be.
I really need help on this.
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.
Hey mercime.
Thanks. I did what you said
Still don’t know what caused it, but all is well now!
Category pages as in- your theme?
If so, I would say this isn’t a buddypress issue.
Use the wordpress forums, or Twenty-Ten Theme Forums if possible.
@Gayatriom Glad you resolved the issue.
@gunju2221 “.. but all is well now!” 
