Payables and Receivables not post through GL

For the past 2 months, suddenly AP and AR post through is not working in GP 2013.

Any idea how to trace this?

I have redone Posting setup twice to no avail

The GL post through batch is is sitting idle in Financial Batch. If we post them, then it is truly posted.

I have read about this problem before, but can not recall the solution.

Thanks

Hendry Leo