Could not duplicate it in 1.4.3 on my PC. Will need some more info to figure this one out...
When you opened Help
1. How did you open it (Help menu, F1 key, Help button in a dialog, ...)
2. Where in Designer were you when you launched Help (Project Open dialog, Ladder View, etc.)
3. What Help Topic number (DMDxxxx) showed up when you launched help
4. Does Help lock up and/or Designer lock up?
5. Can you duplicate this from other places in Designer with other Help Topics? If so, provide info for 1 or 2 of these other places.
6. Does it lock up when searching the Index for other things (e.g. letters other than 'M')?
It could be the precise way/where/Help topic where the actual "lock up" occurs. Regardless, we need to try to figure this out.