Hi,
Keyser soze!
Okay, we seem to have found the answer.
The latest Internet Explorer version does not share cookie files (where all your site settings are stored) with other programs due to a higher security level. You can add imdb.com to the Trusted sites, login to your IMDb account again in Internet Explorer and All My Movies should use your IMDb account settings. Here is the step-by-step instruction:
1) Open Internet Explorer and click Tools (if you do not see Tools, press the Alt key to show the menu bar)
2) In the tools menu, click Internet Options
3) In the Internet Options window, click the Security tab
4) On the Security tab, click the Trusted Sites icon
5) Uncheck the "Enable Protected Mode" box (it should be unchecked for the Trusted sites by default)
6) Click the Sites button
7) In the Trusted sites window, uncheck the box that says "Require server verification..."
Add *.imdb.com to the list using "Add" button
9) Click Close button
10) In the Internet Options window, click OK.
For the changes to these settings to take effect, you may need to restart Internet Explorer and All My Movies. Also, after IE restart, make sure you have logged in to your IMDb account.
After that you can also click "Enable adult titles/names in your searches" in imdb after the search and then this option will work in All My Movies as well.
Regards,