Good to hear it works for you. In my case the Provider is written in Java and it constructs another Java class in the first line. The provider is started but it fails without error when trying to construct the other Java class.
Looks like installation removed all added jars from jvm/ext which is probably causing this problem. I would have expected an error message. It failed when trying to construct abject from class which uses these jars, before trying to use them.
Sorry this thread is not related to XPages at all.