It appears the issues with the Amazon MWS are now being resolved. InventoryLab services and features are back up and running!
For information on the Amazon MWS issue, you can view http://status.mws.amazon.com/.
Thank you for your understanding during this issue!
We are currently experiencing issues within InventoryLab. Some users may not be able to log in without error, and those logged in may be experiencing performance and load issues.
After researching the root cause, we discovered that current problems with Amazon's MWS is affecting the InventoryLab application.
Once this is resolved on Amazon's end, we will reach out to let everyone know.
We appreciate your patience and understanding.
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