Hi mgpw4me, thanks for replying.
The error occurred only in two movies (out of about 2.500). The first one which I noted is "The Artist" (2011) at
http://imdb.com/title/tt1655442 after hitting the button "Importing movie info with IMDB [EN] plugin v.0.9.8xx (something), and when downloading the Technical specs.
The film is already in my Database (without Technical specs Tab) and tried to re-download it (as explained above), that is why I called it "refresh". In all other films it works, except this one. (I don't remember the second case it happened). As it is only happening on two films, it is not serious and all other points you mention, like HDD and database corruption, are all "go". Probably it is imdb's fault.
Thank you again,
Gear