Affiliate menu option is missing


My setup is a Wordpress 3.0 Multisite + Supporter + Marketpress.

After following the simple installation steps (copying the Affiliate folder to wp-content/plugins) and Network activate it... the Affiliate dashboard menu option doesn't exist.

Then I went to Supporter and chose that anyone could use the plugin (also tried with Supporter [auto-activate) but no luck..

I did this steps as the Super Admin of the site.

Oh... and then I noticed that IE was throwing an exception:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; .NET4.0C; .NET4.0E; AskTbARS/
Timestamp: Mon, 25 Jul 2011 06:17:49 UTC

Message: Exception thrown and not caught
Line: 1
Char: 9503
Code: 0

Any help would be appreciated!

Thank you,
Bruno Coelho