Furnaces in the 1.11.0.1 Beta for Windows 10 (running under Developer Mode) aren't taking their inputs as they did in the previous beta. So far I've noted the following:

• Furnaces will not take dried kelp as fuel
• Furnaces will not take bowls as fuel
• Furnaces will not smelt sandstone into smooth sandstone with any fuel
• Furnaces will not smelt stone into smooth stone with any fuel

Furnaces are not totally broken, however. Cooking beef and melting sand are still possible using coal.