From the current configuration guide for R9:
Apple iMac:
21.5-inch, Mid 2011, 2.5GHz Intel Core i5 or faster
21.5-inch, Mid 2011, 2.8GHz Intel Core i7 or faster or 27-inch, Mid 2011, 2.7GHz Intel Core i5 or faster
27-inch, Mid 2011, 3.4GHz Intel Core i7 Operating System: Mac OS X 10.8 in 64bit mode
RAM: 8GB minimum, 12GB accepable, 16GB or more recommended
Any of this familiar?
Otherwise, you may want to do a purge — uninstall/reinstall.
For all the similarities, the full license version is not identical in operation and requirements with the Lite.
jPo
“I always pass on free advice — its never of any use to me” Oscar Wilde.