Image with string occasional glitch

[Carl]

In the attached patch I get an occasional blank frame, when I render it to video this shows as a frame of rubbish. I know this is probably a basic fault of my "programming" but I am stumped as how to keep the patch looking the same but without the glitch. I tried on my old MacBook and a couple of different new iMacs and the result is the same. I guess I am going outside the image bounds? Anyway it is quite hard to see when in QC but basically sprites sometimes blank out.

Cheers
Carl

I don't really make software exactly but use QC to composite video, usually rendering with Kineme QuartzCrystal app. I am currently making a short experimental film about internet scams and have made this patch to overlay onto some video. If any of you kind souls could take a look and tell me where I am going wrong I would be very happy! I know I am a total "lurker" on the list and pretty much leeching some help here but it would be so cool to hand in my film for my MA and be able to say I made the effects in Quartz Composer.

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