just posted this for another issue, but it may well be applicable to your issue as well:
try the following:
1) launch IE, go to Tools & then Internet Options;
2) on the General tab (which it launches to) delete cookies and temporary internet files, including all offline content;
3) go to Advanced tab, lower right click on restore defaults and click Apply;
4) go to Programs tab, middle left click on reset web setting, (recommend you deslect reset homepage);
5) go to Privacy tab (if present), if Default Levels button is active click it;
6) go to Security tab and for each zone set levels to Default Levels if said button is active; click OK.