When Foglight Transaction Recorder(FTR) Agent plays a script it collects data for all instructions and measures correctly, when it fails on a particular instruction there is an alarm raised but there is no indication of why the instruction failed.
When an instruction fails, one can use
 Intelligent Agent link to see if there was an issue with the web URL
 If there is no information, set the agent to run in visible mode. This will cause the agent to capture images for every instruction, hence when it fails the screen shot will help to identify the problem on that instruction.