Did you go through the installation wizard after upgrading to BP 1.5? What’s in your error logs? What’s in your .htaccess file?
Other possible causes/solutions https://buddypress.org/?s=500+Internal+Server
this is the htaccess.file I have not found the error logs yet. I did go through the wizard after installing.
# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ – [L]
# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^[_0-9a-zA-Z-]+/(.*.php)$ $1 [L]
RewriteRule . index.php [L]
# END WordPress
500s are internal server errors. Check your web server’s error logs (or ask your web host to do that for you).
I enabled error logs on my server then tried a couple of the links and downloaded the file. This is all it contained Options +Indexes
edit – missing slash was only obscured in code. htaccess looks fine. deactivate s2member plugin and change to default theme, then run settings > Permalinks.
mercime I don’t know what you mean by run settins >Permalinks. I followed the steps you said but I found nothing that referenced permalinks under the network admin. For now I have deactivated Buddy Press until I can figure out how to repair. Is there a way to get the older version to re-install?