Due to issues with MPOS assessment of network transaction fees, manual payouts have been disabled for the time being. You can still use automatic payments from 0.3 to 25 VRM. For more details, read here: https://www.poolsloth.com/?p=293
UPDATE 24/08/17 @ 2200 UTC: Code to dynamically adjust fees has been written and is being validated and tested. Manual payments and automatic payments > 25 VRM will be enabled once the code is implemented. The code and function will be shared publicly when this happens in an explanatory blog post.