Just because the stove and water heater work doesn't mean that there is propane getting to the burner.
A electrically operated gas valve is upstream from the orifice. Mine has stuck a few times and the solution was to release the gas pressure and then try again. So I'd try turning off the gas at the tank, release the gas pressure at the solenoid or orifice and try again. I'd crack open the line at the solenoid without first turning off the gas. You should hear escaping propane. If you don't something upstream is wrong. Not likely but it confirms that gas is getting past the solenoid.
You could also hold a BBQ lighter by the burner while trying to ignite the burner. If a continuous flame by the burner doesn't ignite it then no gas is getting by the solenoid either because it's stuck closed, the orifice is still clogged or the circuit board isn't sending it a signal to open.
Before anyone jumps all over me,
I should say that, no, cracking open the solenoid fitting without first turning off the gas isn't dangerous. The fitting is brass, no spark hazard, and it's only a very momentary leakage and it can be stopped by immediately tightening the fitting again.