I have the same problem already reported to boonex support together with screenshots. They say unbelievable but I found the problem.

The reason is that ray admin area is writing wrong entries to main.xml files in ray widgets - maybe a mailfunction in license checking procedures.

To get ray widgets to work I editet main.xml files in ray widgets and changed the entry "not registered" to "enabled". It works as a short time solution only because as soon you go the admin area see more of ray entries in main.xml are changing to "not registered" again.