If the steps above don't help...
Propane driven grills, especially propane because of it hot burning temp's, require very small brass orifices to mix the gas with air to get flame. After "interrupting" the gas flow with the regulator change, you can have very small debris floating down the gas line, possibly plugging that orifice.
I'd find access to the orifice (just after the low to high grill valve) and blow it out or, use a small paper clip to clean. The orifce mght be even small then the diameter of a small paper clip so use caution not to enlarge.
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Bob and Better Half
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