That's pretty random.
Can you check the Vent log again (when you are logged into the test user account) and post it?
rt-clik in the vent window > view > log file (also check the console log window)
also
Which Mac do you have?
What OS are you running
Do you have Firewall turned on or any Virus apps.
You may also be having a Malware issue. Check it with this:
www.adwaremedic.com