Just got this in early this morning. Here's the official release notes for L186:
1. Support added for the DishPro+44 switch.
2. Support added for a cascaded DishPro 34/DishPro 21 switch configuration and for a cascaded DishPro+44/DishPro 21 switch configuration.
3. Support added for the DishPro+ Twin LNB.
4. Fixes for OTA channel losses (ie "Channel Not Found..." messages.
5. Some Timer fixes, although there are still a few issues being investigated and tested.
6. Fix for Auto-Tune/VCR timer bug with analog OTA stations.