I just found a bad behaviour while editing a table control on CVI 2013 SP2.
A minimal sequence to duplicate it is the following:
1) New project
2) File -> New -> User Interface
3) Create-> Table
4) Edit table -> Edit Default Cell Values
5) Open "Format and Precision"
6) Close it without any changes.
7) !!! two subsequent popup messages "The index passed is out range".
That's all.
Luckily this does not happens for the analogous command in Row and Column Default Cell Values panels.