The IDM AD driver requires a filter DLL to be installed on all DCs for password synchronization. Unfortunately, it seems as though the IDM 3.5 setup does not always update a previously installed version of pwfilter.dll (and associated files) properly.
The INF installer can be used to update those files so they will be used after the next reboot.
Note: This requires the IDM 3.5 AD driver.
To download the INF installer, visit:
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.