Can't login in admin

[pchulpleusden]

Thanks for the fast reply!

I hadn't see that post,
1. I'm using GS3.0
2. PHP Version 5.2.10
3. I didn't changed any permissions, for /admin/inc/ they're 755
4. Haven't had contact yet, but I'm going to do that now

My .htaccess file in /admin/:
[htaccess]
AddDefaultCharset UTF-8
Options -Indexes

# blocks direct access to the XML files - they hold all the data!
<Files ~ "\.xml$">
Order allow,deny
Deny from all
Satisfy All
</Files>
<Files sitemap.xml>
Order allow,deny
Allow from all
Satisfy All
</Files>

RewriteEngine on

# Usually it RewriteBase is just '/', but
# replace it with your subdirectory path
RewriteBase /GetSimple_3.0/

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule /?([A-Za-z0-9_-]+)/?$ index.php?id=$1 [QSA,L]
[/htaccess]

Also a strange thing, the support page of GS says:
Warning: GetSimple Upgrade needed to 3.0 – Download

But I'm allready running 3.0, maybe is that the problem?