adam solver under windows

I've been teaching neural nets in a class and had a neural net demo that used the 'adam' solver. This works fine under mac and matlab online, but wouldn't run for the students in the class using windows. Is this a known bug?

My workaround was to switch to 'sgdm', which worked for everybody (though was not the solver I wanted).

Relevant bit below.

thank you,

mike h

options = trainingOptions('adam', ...
    'ExecutionEnvironment','cpu', ...
    'MaxEpochs',maxEpochs, ...
    'MiniBatchSize',miniBatchSize, ...
    'SequenceLength','longest', ...
    'Shuffle','never', ...
    'Verbose',0, ...
    'Plots','training-progress');