I am using WordPress 3.5 network with debug turned on. I've just installed a bbPress and your plugin and immediately after I've activated the GetShopped Support Forums plugin, I got several PHP errors.
So I dug into your code to fix those quickly and here is what I came up with: https://dl.dropbox.com/u/2812977/bbpress-vip-support-plugin-EDITED_BY_WEBMAN.zip
Please note, that all my changes in those 4 files are wrapped with "WEBMAN EDITED CODE STARTS/ENDS HERE" notice (in one file there are couple of changes). Please go through that an consider updating the plugin with that (already prepared) code.
Thanks in advance!
PS: Please, let me know when you download the code or I will delete it from my Dropbox in 2 weeks. Thanks.