Hi!
I've installed WP so many times, and I don't recall ever encountering such a problem.
I've got my 2.8.6 installed at the root of the website (La GAMIQ) and then, I installed a second WP 2.8.6 in the /wiki/ directory... and finally, an SMF (Simple Machine) Forum in the /forum/ directory.
Whenever I try to access the forum or the wiki I get either a 404, a 403 or a completely blank page (currently, it's the blank page).
Here's how my root .htaccess looks:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php
</IfModule>
# END WordPress
My /forum/ .htaccess doesn't contain anything.
And my /wiki/ .htaccess looks like this:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wiki/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ./wiki/index.php [L]
</IfModule>
# END WordPress
Any idea is welcome, thank you!