green background in player after saving subtitle

[wowdeathbringer]

Hi,
I have a problem with a specific subtitle, which gets a green background in players using FFDShow or VobSub (e.g. ZoomPlayer, MPC-HC), as you can see on the right side of the screenshot below. On the left side is XBMC (which apparently uses its own subtitle code). I made some tests with the subtitle and for that subtitle the green background color appears as soon as I save the subtitle in SUB(BD) format (SUB/IDX works fine). Maybe you can make out what causes this by taking a closer look at the testfile I made (https://www.dropbox.com/s/8aa3qd45td3n46o/Escape%20Plan%20%28Test%29.mkv?dl=0) and/or shed some light on the differences of the subtitle tracks in that file, so I can hand over that information in the ZoomPlayer forums (where I'am already in contact with a very helpful person).