I wrote a visual webpart in Visual Studio 2010 that works fine in the SharePoint instance on that machine when VS deploys it. It appears in the gallery and I can add the webpart to a page successfully.
I then packaged that webpart, copied the WSP to another SharePoint server, ran
Add-SPSolution, and deployed the solution from Central Administration. However, the webpart does not appear in the gallery. The gallery doesn't even have a Custom folder!
I also tried using the "Upload a Web Part" option at the bottom but that didn't work. I can pick the webpart and click Upload, but it just displays the gallery again without my custom webpart.
I don't even know where to begin troubleshooting. Any ideas?