It is difficult to tell what goes wrong without seeing the Nevron Log file. To enable error logging you need to modify the WebPartsConfig file to record errors and statuses. More information about the config file can be found in the following topic in the documentation:
Getting Started > The WebParts Config File
Any errors that are not reported to the user will appear in the log file.The config file needs to look like this:
<Config>
<Log LogErrors="yes" LogStatus="yes"/>
</Config>
Best Regards,
Nevron Support Team