The American Chemical Society just implemented a new version of outbound OpenURL linking to the full-text of their journals. Unfortunately, our full-text resolver, SFX, does not seem to be playing nice with it. A solution is being worked on.
In the meantime, if you are running across the problem…the good news is that on the error page that you will receive, there will be a link to “ACS Journals A-Z.” If you click on that link and select the title from the list, the content is there. We’ll try to keep you posted on the resolution of the problem.
UPDATE: a temporary solution has been found and access has been restored.