The cause for this has been fixed long ago, there was a related issue lately that was also fixed, but a similar one seems to persist for a few people without us being able to reproduce.
You can help identifiying your specific issue by providing your client logsfiles and / or relevant data from the Windows Event Log in case of the game not closing to [email protected]: https://github.com/StrangeLoopGames/EcoIssues/wiki/Getting-the-Eco-game-log-file
You can help identifiying your specific issue by providing your client logsfiles and / or relevant data from the Windows Event Log in case of the game not closing to [email protected]: https://github.com/StrangeLoopGames/EcoIssues/wiki/Getting-the-Eco-game-log-file