PC 12.01 - Ajax TruClient IE Script Stalling in Controller

Hi,
 
I have created a TC IE script in Vugen 12.01. The script plays back fine in Vugen and the Development Mode. However, once I run a test with only this script and 1 vuser, the script halts after completing the second transaction. The user does not fail, abort, etc, it simply stalls. I developed the script on the same LG used in the test, so I know the script works on that machine. I don't get any error messages so it's hard to troubleshoot what the problem is.
 
Any idea what is going on here?
 
Thanks in advance.