ConvertXtoDVD lost quality after encoding???

Hi, i've used ConvertXtoDVD for some years and its one of my favourite programs due to it's speed and video quality.

I've just finished a new computer build, after installing and using ConvertXtoDVD again i've noticed that the converted output video, or vob files are of very low quality compared to DVDFlick and some other encoders.

I don't recall ConvertXtoDVD being inferior to DVDFlick, for an example, the 10,000BC and Transformers trailers have a green or blue title screen that reads, "THE FOLLOWING PREVIEW HAS BEEN APPROVED FOR" etc.

When encoded with the settings set to high quality the converted video of these screens looks awful, full of the worst jaggies i've seen, you could walk up the lettering on the screen it's that blocky and the video seems like it's of low resolution and small compared to standard vob files or ones i've converted with DVDFlick.

I'm not sure if ConvertXtoDVD has trouble converting these type of screens, computer generated, or if there's something else thats wrong?

Thanks for your time.