This is a bug related to scirra.com/forum/array-values-not-being-set_topic53695.html where Ashley sad that it could be happened only if a layout has been deleted.
If you create a new array when an event sheet is on focus in the editor, the array do not have properties - maybe the hidden instance is not created.
But if you have a any layout on focus in the editor it have the properties.
Could you solve this bug please!?
We made some fixes for this in r97, can you still reproduce the problem there?
Tahnk you Ashley! Actually I'm not able to update to r97, but will check it with this version as I can.
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I think this is officially fixed in R98.