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Thanks for posting your question and thanks for using our library. There was a very similar post by another user about real FFTs and I replied to him explaining how to properly compute forward and backward real FFTs. Sample code are also present in that post. Here it is:
Please read that and it should help you. The pdf manual that comes with our library is also very helpful. Let me know if you have additional questions. The key point to note is that the forward FFT plan can NOT be re-used (unless plan parameters are changed appropriately) for backward FFT.
thanks for your quick help. With your code from the other thread I was now able to correct my own code. Thanks a lot.