Glad you got it cleared up.
Propane system is only 0.4 psi (11"WC) so it doesn't take very much to disrupt the flow
With the low pressure the air/fuel ratio is critical and anything that disturbs that ratio will prevent ignition
Just for some clarification
Burner ORIFICE...that is the gas nozzle. It is very small metered opening
Clean by soaking in alcohol and then blow dry using LOW Pressure air...never poke anything thru the small opening as that will damage it
Burner TUBE.....pipe that air/fuel mixture flows thru to combustion chamber opening where the Spark Electrode ignites the flame. Propane must flow down center of tube, drawing air in and then mixing. IF tube is not aligned the propane will bounce off sidewalls of burner tube and NOT mix with the air causing ignition issues due to incorrect air/fuel ratio
That is why a spider web can cause issues.
Spark Electrode needs to be 'engulfed' in flame when it ignites...flame proving
And spark gap (distance between electrode/ground rod) should be 1/8", high tension wire connection clean/tight and ceramic insulator not cracked
