I believe I've fixed the bug related to "select failed: 10038" (error WSAENOTSOCK). The select error is not a big deal, but it led the communications thread to get blocked on a socket that should have been in non-blocking mode but wasn't. It never came up until now because as long as select never failed, receive would never be called unless there was data.

Without this fix, your node's communication sometimes goes dead. Connections are still made, but no data is passed. Any generated blocks would probably not be accepted since you can't broadcast them and other nodes will leave your branch behind. That's why Generate doesn't run when you're not connected.

This could also have caused bitcoin.exe to fail to exit. There's no reason for shutdown to wait for the com thread, so I made it only wait for the message processing thread. I'll do a more thorough forced shutdown later.

Looks like your node's com thread just now got blocked on this bug again. It went for a few hours this time before it did.

Version 0.1.3 exe attached.