I have now fixed the Rating problem with the IMDB movie provider, new version is 188.8.131.52.
To get the new version launch TViXiE (must be version 1.3.2 or newer) and do the following:
* Click Tools->Update Manager
* Click "Check for updates..." button
* Check the "Show only newer or updatable" checkbox
* Select the IMDB provider in the list
* Click the "Update" button within the IMDB provider selection.
* Restart TViXiE and you're done.