The WhatPulse has a verbose (or debug) mode where it can output a lot of log messages which can be useful for troubleshooting an issue.
To start with client with verbose mode enabled, launch it from a command line (CMD on Windows or Terminal on OS X) with '--verbose' as a parameter.
Example - Windows
C:>cd "Program Files (x86)\WhatPulse2"
C:\Program Files (x86)\WhatPulse2>.\whatpulse.exe --verbose
The log messages will be in your app.log (which is located in your Data Directory)
Example - OS X
The log messages will be outputted in your Terminal session.