We experienced some problems with our systems today which resulted in a number of tasks being stuck. We've now resolved these issues and Dataloader.io is now running through the backlog of queued tasks such that you should shortly be able to see your task marked as completed.
We are working hard to improve our systems and supporting processes so that such issues do not happen in the future.
Thank you for using Dataloader.io and apologies for the issues that you experienced today. Please do let us know if you have further issues and/or have further feedback for us!