If someone has trouble opening a document in JSTOR while using Internet Explorer, you can try another browser (Firefox, Chrome, etc.) or use Keith's resolution below:
Problem can be resolved by opening the Internet options (under cogwheel in upper left of browser), click on Advanced tab, click on Restore advanced setting, then click on Reset button. Note: all other applications and windows need to be closed when doing this. After the reset, close the browser, then re-open and it works. There is a setting or combination of settings in the Internet options that may be causing the problem—it would require several hours of comparing and testing the various combination of settings to determine the actual root of the problem.
--Melissa