I did this code to test and it runs in debug mode at least, I get a line with "hej" on the debug area. Could there be a character(0) or a linebreak somewhere in the file you are reading in? Check with a hex-editor in the file to see that there isn't any strange characters and also in the variables on the right side when you debug the code.
strLine$ = "20,FIRE BUTTON INCREASES SPEED,FEUER-KNOPF BESCHLEUNIGT,APPUYEZ LE BOUTON FEU POUR AUGMENTER LA RAPIDITE,JOYSTICKKNAPPEN ÖKAR HASTIGHETEN,jmnoj` ncm) sbekhwhb`er qjnpnqr|,SKYTE KNAPPEN GJØR DET RASKERE"
IF SPLITSTR( strLine$, st$[], ",") = 7
DEBUG "hej"
ENDIF