I will continue to offer free support for WP to Twitter within reason for as long as I can. However, you should know that support is very time consuming, and I can't guarantee a response to every request. Your donations and purchases help keep support and plug-in development a reality.
With free support, I greatly prefer if you submit a support request form from your plug-in's Settings page. That provides me with data for further pursuing your issue.
At minimum, please be detailed about the nature of the problem.