What the hell is going on with Illustrator?

[user8300274]

I have the feeling that Illustrator is getting worse and worse.
I create a circle and get a hairy ball.
When I want to create exact figures, for example for smaller icons, an exactly straight line or a run or a simple circle turns into a crater landscape. Nothing about the figures is correct any more.
That can't be!
I had always found Illustrator to be a very precise tool. For a few years now, I can't rely on it!

[Ton Frederiks]

It may be a GPU preview problem, fast but sometimes inaccurate.

Can you check if it goes away when you switch with Cmd or Ctrl E?

[user8300274]

I don't know. after I exported/saved it as SVG, the line looks the same or worse

[user8300274]

Other colleagues have told me that the SVG looks the same on their computers.

[Ton Frederiks]

Can you share the ai/svg?

Dropbox, CC filesharing, WeTransfer, Google...

[marliton]

Hi. Please check in the Appearance panel if the circle has some Brush applied. You can click the "Clear Appearance" button on this panel to remove any extra effect, brush, etc.

[user8300274]

this is the file.

the red arrow is pointing exactly on the issues.

the circle is out of the line, the rounded corners have a lot of wrinkles, the arrows as well... 

[Ton Frederiks · Accepted solution]

Looks like a Preview problem to me. It disappears when I switch from GPU to CPU Preview with Cmd (or Ctrl) E.

[tromboniator · Accepted solution]

The problem is not universal: I've opened your test.svg and do not see the hairy ball — all paths are smooth, whether in GPU or CPU. Possibly another app conflicting?

Peter