I have a third party custom DLL that I'm trying use from my web part. I've deployed the DLL to the GAC, it's strongly named, listed in the SafeControls of the webconfig. I can successfully use the DLL when using an ASPX page, but when I try using it from a web part, I get an error. Just including it in the references causes it to error. Thoughts anyone? I'm new to SharePoint and ASP.Net so I fully admit this could be a newbie-level issue.