As you can see, all the highlighting is misaligned. This it what happens, when I run p4merge (Rev. P4Merge/NTX64/2015.2/1312139) from Matlab (R2016b prerelease) on Windows 7 x64, via RDP connection. I was able to reproduce this on two different PCs.
The command, I execute in Matlab is:
system('D:\Software\Perforce\p4merge.exe C:\temp\1.txt C:\temp\2.txt').
This does not happen, if I run the same command from windows cmd or open files with "File->New Merge of Diff" (see the right part of the screenshot).
The test files I've used are attached.
I'm not sure how is this possible .
Hope you would consider this info interesting.