The versions of PhoenixMiner before 4.0 only support DAG epoch up to 235. ETC passed epoch 235 a few weeks ago, and recently ETH also passed DAG epoch 235 and is now on 236. The unfortunate result is that the old version(s) of PhoenixMiner won't be able to create DAG or mine ETH or ETC any more - you must upgrade to PhoenixMiner 4.x.
   We have printed this warning here during the release of PhoenixMiner 4.0 but admittedly we could have done much better job with making it visible. We will pin this message in the first post too.