An R68 process errors with a 'Did not finish' status due to a missing GL Account in the GL Setup. If you move from the R68 process status page and then return to the status page it has changed to 'Completed' but the payment record has no Gift Aid GL Distributions. Also there is then no way to edit or recover the Gift Aid GL distributions.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.