Variables defined in action args are not forced to lowercase like they should be, which causes the variable to be inaccessible.
The following code demonstrates this:
Code
<action name="testaction" scope="local" args="testA"> trace('testa=',get(testa));
trace('testA=',get(testA));
</action>
Console Log:
QuoteINFO:testa=null
INFO:testA=null