QB Issue Resolution:

For this type of error, clearing the cache and cookies from your browser should fix it.

Here’s how:

http://support.qbo.intuit.com/support/answers.cfm?faq_id=1038

If that doesn’t do the trick, try another browser. That’ll tell us if we’re dealing with a browser specific issue.

Please give this a try and let me know if it works.

Resolution for Issue 'why do i keep getting this error Unable to load https://qbo.intuit.com/qbo32/neoservice/lists/name/list?nameType=vendor&includeNameOnly=true&sort=+overdue status: 400' available: Yes (Solved).
Source: Intuit Community forum.

why do i keep getting this error Unable to load https://qbo.intuit.com/qbo32/neoservice/lists/name/list?nameType=vendor&includeNameOnly=true&sort=+overdue status: 400: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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