Technically, LoadRunner 12.0 does not support Chrome v38. Not sure if the Chrome version is related, but perhaps downgrade it to v35 and see if you have any observed improvement.
From the ReadMe file in LR 12.01:
New supported technologies and platforms
Windows Server 2012 R2 and Windows 8.1 support (added in 12.01)
Record support for Web-based protocols with Internet Explorer 11, Chrome version 35, and Firefox version 29
Support for latest versions of Eclipse, JUnit, NUnit, Jenkins, and Selenium (updated in 12.01)
Revised Linux load generator support matrix and support for SUSE (added in 12.01)