[CMSMS 0.13] Strange Smarty error

[jmcgin51]

If I make my links using the FCKEditor link generator, everything works ok.  But if I type in the same links by hand, it breaks...

[Bumble]

Now I upgraded to the latest version, my Admin is not reachable.

I get this Error:
Fatal error: Undefined class name 'useroperations' in /var/www/html/cmsadmin/login.php on line 51

Edit:
I completely removed CMSMS and installed it again, this is very interesting. My homepage where the CMS page should be gives a 404 error, the admin panel says when I give the right account information that the password or username isn't oke.
I'm sure it's good, because the install file emailed my account information 

What is this and how can it be solved? It's starting to make me tired..

[Fido]

which version the upgrade ?

you can edit your config.php file to acces your admin...

[Bumble]

which version the upgrade ?

you can edit your config.php file to acces your admin...

The latest downloadable version, 1.0beta

I asked my hosting provider to replace a backup that was made last night. So then I'm back at the start, the strange error as described in my startpost.

[Bumble]

Still strugling with the strange error, upgrading didn't fix the problem.

So I asked my provider to put back the latest backup, so the error as described in the startpost is back agan.

Before this error, the page looked like this: http://www.prmedia.nl/cms_should_look_like_this.html, here you can see wich smarty tags I use, and you'll see that I don't use very much smarty tags.

The error page can be seen here: http://www.prmedia.nl/indexcms.php.

Hope there'll be somebody that can really help me!