I attach a simple grc file that works for me. Using the delay10/delay sliders try to align the input/output bit stream. (in this example this happens at delay=12, but it may be different for you...)
Then play with the noise variance; you will see the BER changing slowly as you go around values = -6,-5,-4 let me know if this works for you, Achilleas
test_QAM.grc
Description: Binary data
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