QB Issue Resolution:

Did you perhaps open an old data file? Or restore an old .qbb (backup) file? Are you looking at a different account from the one that was reconciled on June 30?

Resolution for Issue 'In the window for bankreconciliation, tells me that the account has not reconciled since October 31,2017, I just reconciled June 30,2018' available: Yes (Solved).
Source: Intuit Community forum.

In the window for bankreconciliation, tells me that the account has not reconciled since October 31,2017, I just reconciled June 30,2018: 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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