Cant run client, just "Waiting for log output..."

Hi,

I am creating mods and utils for mc since quite some time, but with the new launcher there are quite a few bugs.
About 1 year ago i made a simple client for mc to show the current sessionID and add it in eclipse to launch-args and play on online servers. Since the big Launcher update, launching this custom Client just takes ages to launch (~2 min). With the latest launcher update the client does not launch at all 😞 When activating the console, it does not print anything at all.