pretty permalinks work fine and I have enabled other than the default. The link you passed on suggests:
Notes:
1. WordPress msut be installed manually i.e. via FTP, cpanel, etc. and NOT via webhost scripts which bring about numerous issues when BuddyPress is activated.>> I have been using the installer via wp. Should I be doing the manual install? Do you have a link to instructions?
2. BuddyPress does not work on installations where you give WordPress its own directory. >> I have now installed BP/WP on the root folder for the domain whereas I had it under the subdir blog. Still doesn’t work. Can I install both wp and bp to blog?
Q: How do I ensure mod-rewrite is enabled? If it’s a matter of making log entries in wp with ‘other than default permalinks’ selected, then this is fine and I can post to the wp blog.
Q: You say check the htaccess file. What am I looking for?
