First, test your macros using IR only,directly from the MX-850. Unplug the MRF for this testing.
Add 0.5 sec - 1 sec delays between each step, but not as the first step or last step. If that doesn't work, create your macros and save one step at a time, to see where it may be going wrong. For example, create a macro with one step...then add a delay and the second step and so on.
Let me know if this works for you.
Thank you,
Damon DG
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