From Version 3.8 up to the current 3.9-beta1 the write() function of SlideShow results in an ArrayIndexOutOfBoundsException.

The SlideShow is created from an array of bytes containing a valid excel file,
and then even without modification if the write() function is called (for streaming to the client) the exception occurs. With final version 3.7 everything is fine.

What is done:

SlideShow ppt = new SlideShow(
    new ByteArrayInputStream(byte[] data)  // data containing valid ppt file
);

ByteArrayOutputStream out = new ByteArrayOutputStream();
ppt.write(out);