I had an odd issue with my day notes blog that I manage using Drummer. Somehow the XML format of the OPML file of the blog became mal-formed in that a right square bracket "]" got added at the bottom. The result is that the OPML file would not load in Drummer.
I downloaded my Drummer files to a computer, opened the blog.opml file in Emacs, and corrected the file. Deleted the old file out of Drummer, created a new blog.opml and then imported from a local file. I had to add the header values needed by the Old School blogging engine to get everything back in order.
Notes From The Cave 