If your preferred browser is Firefox and you have upgraded to version 5 (released earlier this week), you may find that you have problems accessing ARTstor.
ARTstor is not currently compatible with Firefox 5, but technicians are working to fix this problem. In the meantime, the folks at ARTstor advise you to uninstall version 5 and use Firefox 4 instead, or simply switch to another browser, such as Internet Explorer or Safari.
If you need help with any of this, please get in touch with me!