JPEG Rotate seems like it's crashed my machine
The "JPEG rotate" plug-in doesn't crash. It's just really slow on OS 9. Versions 1.4 or newer display a progress bar during the rotation.
Are there any issues converting file formats?
iView MediaPro relies on QuickTime to do the conversion. Two formats not supported are: MPEG with multiplex sound and CMYK images.
Make sure to update to the latest version of QuickTime so that you have the best conversion capabilities.