After upgrading from 1.3.8 to 1.5.1 all plugin files are update and in place, yet going to any EX Pages throws up WARNING: An Error occurred, please refresh the page and try again. Also, there is nothing in Admin>Tools to uninstall and reinstall. It occurred to me that there might not be a link in the 1.5.1 Admin without an SQL update but I cannot update that without that uninstall/install link to begin with.