You should be able to view the igniter directly by taking the door panel off by removing the 2 screws either side on the inside. Once the door panel is off (leave the door switch connected) remove the belt from the drum.
Start the dryer and look right into the burn tube.
The igniter should read between 3.2 - 3.5 amps, we know it's drawing enough amps because it's opening the valve, however the igniter may be damaged and not getting hot enough.
You should not try to light the gas with a BBQ lighter.
Basically Steven in a nutshell the problem is with the ignition system, there are only a couple things that can cause this. The igniter or the valve. We can smell gas to the problem must be the igniter.
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The conversation to propane may be the cause since they would have to have pulled the igniter out to replace the orifice, they may have cracked it.