You can resolve most issues with the resources here.
New: To get support, join the Support and Beta Test community on Google+.
Please note that the old Google Data service used to upload scans to Google Drive has been shut down. This is the reason for "400 Bad Request" errors you may see if you use the Drive OCR feature. The temporary workaround is to share scans with the Google Drive app on your device. An update is under development that uses the new Google Drive API.