Eraser tool is jagged

I am working on smoothing the edges of a graphic. I know how to pick my eraser tool, the hardness, opacity, etc. So.....
I'm cleaning up this graphic nicely and I save the file. I open it up later and the edges that I have already smoothed are all jagged now. Also, as I continue to erase, the tool is still jagged. It is a brush tool at 100% opacity and hardness, etc. It is the same tool and setting that was working beautifully before I saved the project.
I have an image of the jagged (pixelated) graphic attached (I hope the jaggedness is visible in pic).... Remember, it wasn't jagged when I was working on it before.
What do you think happened?
Thank you!

Ok I haveinvestigated this and the OP is correct and Doug is correct as well…WHAT?
Yes indeed they are both correct.
You can call it a bug and I think you would be correct and you can also say it is not a bug and probably be correct as well.
This is the thing this will occur as the OP describes but it depends on the size of the dash or should i say the expanded object.
Exactly at what size (length) this problem disappears I have not been able to determine but if you made the dash like 8 points you would surely be fine.
Make it less than a point and you definitely have a problem. The eraser tool can only be 1 point minimum and that might be the problem.
Draw ay small shape less than a point in length and use the eraser tool and you will see what I mean.
So this is not dash line specific but a tolerance limit be it expected or by design or a bug is probably how you choose to look at it.
So what does this effect have on the workings or Illustrator to Adobe this was probably acceptable and if no one complains about it or describes it in itss true sense Adobe will either not be able to reproduce it or will they correct it.
I don't see it as a bug as there are ways to accomplish and effect the same result in Illustrator I see it as a feature request to be able to effect smaller tolerance either with a new tool or with improvements to the current tool(s). In the case of a dash line it might be good o be able have an eraser tool that erased the path as an effect so that the dash did not reflow and the path seemed to be shortened. That would be a very handy tool since you would not need to expand the stroke and would have control over the length and size of the path.
But this type of eraser effect is probably not possible.
So if the Op and Scott see this as a bug I think they should mention the fact that his is a tolerance issue that needs to be addressed and they should come up with a good reason or two why it should be changed.
I am going to get breakfast.

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