SUMMARY:
To repair broken functionality in LDLS3 if IE9 is installed, run the attached registry file: 8473.IE9-LDLS3.zip
This file is per-user, so you will need to run it for each Windows user that logs in and runs LDLS3.
LONG VERSION:
If you have used the registry file above, you do not need to follow these steps; this information is provided for those who want more technical details.
Microsoft has provided a mechanism to prevent the incompatibility between IE9 and LDLS3. To fix the problems with IE9, open Registry Editor and navigate to the key:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_USE_LEGACY_JSCRIPT
Note: create the FEATURE_USE_LEGACY_JSCRIPT key if it does not already exist.
Create a new DWORD Value named LDLS.exe, and set its value to 1.
We have not received an update from Microsoft as to whether this fix will be in the RTM version released on Monday. However, it should not cause any problems to install the fix above, even if IE9 RTM is not affected by the bug.