Hi CRR,
Period End in AR and AP don't have any effects in regards to GL. The biggest thing you would lose by running Period End in AR today with a log-in date of Jan 31/2012 are the Month-to-Date statistics that are stored on customers. This may not even be an issue for you if you don't use these customer statistics.
If you care about the statistics, you would either have to restore the AR data from a backup, or edit the month to date statistics with the correct values (this includes importing), after enabling statistics editing from the company profile. Probably entering the new MTD statistics would be easier.
Period End also clears completed transactions to History (only if you do so by Period End), optionally clearing the Batch Status file, optionally purging history, and optionally clearing retainage if you use JobCost, but none of these has any effect on GL.
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Regards,
Softrak Tech Support