I had this problem. The FileInfo panel actually took my first title defined in the manifest.xml before I opened it the first time. Then I wanted to change the panel's title and description, but it wouldn't update. The quick fix was to rename the folder for the new generic panel. That made the FileInfo panel look at it as a fresh panel and reload the manifest.xml.
So, rename ./panels/generic panel copy/
to ./panels/generic panel 2/