When pictures are not displayed, it could mean that the picture format you are trying to display is not a supported format on that machine. This can easily be tested using the command:

PICTURE TYPE LIST (formatArray{; nameArray})

The command PICTURE TYPE LIST fills the formatArray array with picture import/export QuickTime codes available on the machine where it is executed. You can therefore easily see if the picture your are trying to display is supported.

Note: The description for the command "PICTURE TYPE LIST" can be found at the following location:
https://ftp.4d.com/aci_Technical_notes/ACIDOC/CMU/CMU00681.HTM