What is the subtitle format of the video file you tried to convert with DVDFab? Please use the free tool MediaInfo to analyze the source file and post the result here.
Mona
This is from two different files, apparently dvdfab hates utf-8 as the ones that are ok are pgs.
File #1
Text
ID : 3
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Language : English
Default : No
Forced : No
file #2
Text
ID : 3
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 46 min
Bit rate : 72 b/s
Count of elements : 2404
Stream size : 89.0 KiB (0%)
Title : English (SDH)
Language : English
Default : Yes
Forced : No