Not sure how many people know this, and I've just discovered it, so I'll pass it along:
When editing plan sets, not the drawing information, but the plan set information, if you want to rename a drawing etc. it doesn't seem to refresh easily. I've tried removing the title block and re-inserting it, which does work, but is cumbersome. However, if you bring up the project information box, and without editing anything press OK, then ALL the information in the plan set titles is refreshed, including all the drawing names. Much quicker ....