@mrstendal Without any error Or looking code its difficult to address actual issue reason. But do make sure below things.
1. Credentials which you are using is not expired ?
2.Contact to Shopinggeeder with your account to check the status.
3. Enable Magento error log (If not enable) from menu System >> Configuration >> Developer >> Log Settings
If above all points are okay then issue might be on coding side, take a help of programmer for identify issue.
Good luck
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Magento Programmer | Was my answer helpful? You can accept it as a solution.