I deleted a workflow from SharePoint designer and now whenever I try to open the Workflows dialog on a list item it gives me the "An unexpected error has occurred" box. I suspect that this is because the workflow history that shows in this box is now corrupted and pointing to an old workflow that is no longer there. I restored the workflow from the recycle bin but I am still getting the error.
Another change that I had made that could be causing the issue is I deleted all of the initiation form parameters that were multi-line text boxes and recreated them as single line text boxes. I do not believe that this could cause the issue though.
Anyone have any ideas?