What may cause jitter in a graph?

A simple VI to convert a string into a dot matrix text display (XY graph) worked fine initially. After seemingly minor cleanup in the block diagram, the text jitters back and forth during updates (see attached vi). A subtle error is suspected. Help would be appreciated.
Attachments:
StrToDots.vi ‏36 KB

Ah, the free property to reference bug ... oh well.
Just adding a loop and a small wait seems to calm things down, i tried with 100ms, and didn't see any jitter then, but it could feel slightly sluggish if you're writing fast. At 33 (30 fps) or 40 (25 fps) it jittered some, at 50 (20 fps) it was rare for me.
Some testing shows it's the XY graph resizing that's the issue, if you set it to a fixed size you wont get an issue. If you dont change the minimum scale it wont be much issue. Look at this slight modification, instead of using negative coordinates i subtract the minimum, normalizing it to 0+ so i dont have to change the minimum scale. I haven't seen a single glitch this way.
/Y
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