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Did a flight with my quad copter apm 2.5+ Arducopter firmware 2.9.1b

Downloaded dataflash   .log file from Arducopter and saved the log file in two PCs

PC1 Running Vista,  MP 1.2.51  (updated a few minites ago)

PC2 Running Windows 7 Professional   MP 1.2.51  (updated a few minutes ago)

The column headers in the Log Browse window are different. Get to window by open MP without usb or telemetry connected.  Click on Terminal, Click on Log Browse and select the .log file. 

in the Vista pc the column headers for CURR are:

Thr In, Voltage, Current, Current total    (this is not correct for the data values)

in the Win 7 pc the column headers for CURR are:

Thr In, Thr int, Voltage, Current, Current total   (this matches the data values)

Others are different also, 

in the Vista PC column headers for NTUN (8 entries, 7 labels) are:

Yaw, WP dist, Target Bear, Nav Bear, Alt Err, AS, NavGScaler    (this is not correct?)

in the Win7 pc the column headers for NTUN (8 entries, 8 labels) are:

WP Dist, Target Bear, Lat Err, Lon Err, Nav Pitch, Nav Roll, Lat speed, Lon Speed

I did a some digging to find out why this might be the case

The dataflashlog.xml files in both PCs in the APM Planner folder (Program files) are the same.

      (checked identical line for line with a file compare program)

The data values shown in the columns for the various rows (CTUN, NTUN, CURR, etc) are the same in both PCs

Seems to me the dataflashlog.xml  file is what decides the column headers so why are the actual headers different with the same log file, same MP version and same xml file?

Is there another configuration I am missing?  

Any thoughts?