RasmusDSP will not load with Java 7 update 55 for currently unknown reasons. Frinika 0.7.3 and earlier versions are affected so that Frinika will not launch at all. As a workaround Frinika 0.7.4 was released today, ignoring that RasmusDSP is not loading. Hopefully it will work again in the next Java update, but I will also investigate this as soon as possible.
2014-06-01 UPDATE: The problems with RasmusDSP is now fixed.