EMC Hangs when loading this code????

(Process Variables)
#11 = 5  		(X Max)
#12 = 4			(X Min)
#19 = #11		(X Current Location - Start at Max)

#21 = 4  		(Y Max)
#22 = 3			(Y Min)
#23 = 0.2		(Y Step)
#28 = [0 - #23]		(Y Step with Direction - Start out Decrementing)
#29 = #21       	(Y Current Location - Start at Max)

#31 = 1.2		(Z Max)
#32 = 1			(Z Min)
#33 = 0.05		(Z Step)
#39 = #31		(Z Current Location - Start at Max)

g0 x#19 y#29 z#39  (Set Starting Point)

o1 while [ #39 GT #32 ]  (Z loop steps down)

	g0 z#39 

	o5 if [#28 LT 0]  (If step direction is down, step down. Else step up)

		o2 while [#29 GT #22] (Y loop steps down)

			g0 y#29

			o3 if [#19 EQ #11 ]  (X pass min to max to min)
				#19 = #12
			o3 else
				#19 = #11
			o3 endif

			g0 x#19
		
			#29 = [#29 + #23]  (Decrement Y)

		o2 endwhile

	o5 else

		o6 while [#29 LT #21] (Y loop steps up)

			g0 y#29

			o7 if [#19 EQ #11 ]  (X pass min to max to min)
				#19 = #12
			o7 else
				#19 = #11
			o7 endif

			g0 x#19

			#29 = [#29 + #23]  (Increment Y)

		o6 endwhile
	o5 endif

	#23 = [0 - #23] 	(Reverse Y Step Direction)

	#39 = [#39 - #33]  	(Decrement Z)

o1 endwhile
M2

(Process Variables)
#11 = 5  		(X Max)
#12 = 4			(X Min)
#19 = #11		(X Current Location - Start at Max)

#21 = 4  		(Y Max)
#22 = 3			(Y Min)
#23 = 0.2		(Y Step)
#29 = #21       	(Y Current Location - Start at Max)

#31 = 1.2		(Z Max)
#32 = 1			(Z Min)
#33 = 0.05		(Z Step)
#39 = #31		(Z Current Location - Start at Max)

g0 x#19 y#29 z#39  (Set Starting Point)

		o2 while [#29 GT #22] (Y loop steps down)

			g0 y#29
		
			#29 = [#29 - #23]  (Decrement Y)

		o2 endwhile
		
m2