There are a couple of tools for debugging in MyChat.
Description of server errors. You should start with them when a problem occurs. System log can also be helpful.
MyChat Client error description, its work log, and files of update logs.
Matching this data and reading recommendations or data in the Help you can solve the main part of a problem.
For more complicated situations visit MyChat official support forum.
If the program crashes due to some internal error, you should send a bug report to fix it quickly.
How to send a bug report about MyChat Server?
How to send a bug report about MyChat Client (win32)?