rewire issue (cannot open reason engine message)

It would seem randomly I’ll go to open cubase, then reason (in that order), and I’ll get a message stating reasons engine won’t open, make sure ono one instance of reason is open. Sources on the Web say to uncheck release driver when not in use in the device setup menu. Mine is always unchecked, but still cubase is not opening the reason engine.I am using osx 10.7.5 cubase 7 elements\ and the built-in sound card on the iMac 2010. Any help would be great I hate having to gour thru uninstall reinstall nonsense to get things working