I have recently run into problems with maplex label engine not being enabled on new layers. I played around in the Label Manager and that didn't work immediately. It randomly started working on the new layers 10 minutes later. I would like to know how to make sure maplex label engine is enabled for any new layers I add to future maps so I can place the labels properly. It was a Placement Properties issue I was having, only showing the default options instead of the maplex options.
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You don't state which version of ArcGIS you are using, but it is possible to set Maplex to be the default label engine for new map documents. ArcGIS Help - Setting Arcmap options
If you are still having trouble, most problems can be solved by either resetting normal.mxt or rerunning your installer and choosing 'repair'.
