Hi,
Thanks for the information.
The error messages are reported to appear due to a difference in execution of TC FF between interactive and load modes which was present in LoadRunner before version 12.
Could you please share a screenshot of the issue or the log file where you got the error messages?
Have you tried to run the script directly from Controller (not via Performance Center)?
And could you try to record the problematic steps using TruClient for Internet Explorer and check if the issue will appear?
Thanks and Regards,
Chau Nguyen