Code Checks for Dutch Flats

I am aware that code checks are not carried out for user defined plates.

For this reason I tried to use the pre-loaded Dutch plate/strip profiles, thinking that the program would know it is a flat and use the appropriate section of the code to calculate the code capacity.

However, I ran into problems. One model (it was a complex model) simply crashed if I changed one of the members to a Dutch flat returning "Exception [Unkonown (-529697949)] Raised! Aborting Analysis....."

So I tried a simple model consisting of 3 nodes, 2 supports and a node load applied at midspan.  This time the model didn't crash but the figures for the code check seem to be incorrect.

STAAD says the member fails with a utilisation ratio of infinity. This is due to it having a shear capacity of zero (AISC 360-10 ASD):

SHEAR: FORCE: CAPACITY: RATIO: CRITERIA: LOAD CASE: LOCATION(ft):
MAJOR(VZ): 0.001 0.000 Infinity Eq. G2-1 1 0.000
MINOR(VY): 0.001 0.000 Infinity Eq. G2-1 1 0.000
INTERMEDIATE: Aw: Cv: Kv: h/tw: Vn:
MAJOR(VZ): 0.000 0.000 5.000 Infinity 0.000
MINOR(VY): 0.000 0.000 5.000 Infinity 0.000

TORSION: FORCE: CAPACITY: RATIO: CRITERIA: LOAD CASE: LOCATION(ft):
0.000 0.000 Infinity Eq. H3-1 1 0.000
INTERMEDIATE: Fcr: Tn:
0.000 0.000

Is this a hopeless case and I should give up trying to force STAAD to do a code check for plates? Or am I making a silly error somewhere?

Version: 20.07.10.41