Hi Mariana,
I have also to the support email you sent. I assume you got the acquire6.cpp example from http://forums.ni.com/ni/board/message?board.id=170&message.id=66444&requireLogin=False .
If you read the response from the NI AE in that post, you will see another solution posted. I would highly recommend his suggestion to use specific datatypes instead of Variants. For example, try using a 2-dimensional character array for the string array control and use a struct for the Error Out cluster. Please try that and see if it works better.
Hope this helps. Please let me know if you have any further questions.
A Saha
NIC
Anu Saha
Academic Product Marketing Engineer
National Instruments