I work for a printing company, and we see this sort of glitch a lot. We also see it in the same design over multiple different systems so this must be an Illustrator issue rather than a compatibility problem with our graphics cards.

When rendering with the GPU, fill colors will extend out past the shape bounds. When we switch to render with the CPU, the glitch disappears. See the example attached.

This is a problem for us. We are losing production time because our printers on the floor see this and assume its an error with the artwork and flags it as such.

System info:
Windows 10 64bit
CPU: Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz, 3501 Mhz, 4 Core(s), 8 Logical Processor(s)
GPU: NVIDIA Quadro P2000
32GB RAM

I've got a two-GPU computer. If I'm using GPU preview mode, after working for a while (around 20-30 mins or more), the entire Illustrator UI will glitch out and become very artifact-y and unresponsive, and I can no longer work on the files I've got open, necessitating a restart of the app.

This started happening right after I upgraded from one GPU to two, about a year ago. It happens only in GPU preview mode, not CPU. I've tried updating GPU drivers, updating Illustrator itself--nothing fixes the problem. I've seen other people online with multi-GPU setups say the same thing happens to them, so I'm not alone.

Not clear this is actually GPU-related.

This bug dates back 32 years, all the way to Illustrator 1.0, when Adobe used the term "QuickDraw" to describe it. Terminology has changed, the bug has not. It has happened on every version of Illustrator, on every Mac, under every operating system.

I've sent the attached screenshots and videos in the past, no response.
The bug manifests as stray lines or incorrect vectors at certain seemingly-random resolutions.

In preview mode, in addition to above problems, (possibly a different bug), I often get sectors or areas that do not fill or redraw correctly. Sometimes a black rectangle where none should be, sometimes just blank white space.
sometimes some stray diagonal lines, often when I 'move around' in a document in preview mode, new areas do not "refresh".

It is unclear if Adobe is receiving these files because UserVoice seems very buffy and may not be able to handle the QT videos adobe tech support requested.

mac OS 10.15.1 (19B88)

iMac (Retina 5K, 27-inch, Late 2015)
4 GHz Quad-Core Intel Core i7
AMD Radeon R9 M395 2 GB

I have an issue regarding inconsistent appearance between GPU and CPU modes when using composite fonts. Attached are the screen shot images of the identical material when captured in (1) GPU-mode, (2) CPU-mode, and (3) GPU-mode after outlined.

As the files show, the last 2 characters show up at different position. The outlined characters show up in the position identical with (2). So I guess (1) has some issue (not displaying the pre-outlined characters at the correct position).

It is very stressful and affecting my professional work, so I would like to get the issue fixed ASAP.

The composite font I used in this example are with 2 Japanese fonts. The "Kana" letters are little bit scaled at center.

Hello, I'm using a MacOs 10.14.6 2.6 GHz Intel Core i7 and I have Illustrator 23.1.1.
I've been having the following issue (even before updating to this version).
Every time I use the CPU view Illustrator becomes really slow and laggy.
I mostly use GPU mode for this reason but the colours are not accurate in this view. Colours look more opaque.
I tried resetting my preferences, disabling GPU performance, disabling dictation on my mac, change my document raster effects settings to screen (which made a little bit better), but nothing quite work.

I can't continue with the workaround of using GPU because I obviously need to see my colours right as I work. Not sure if inaccuracy in colour on GPU is common or if this is another issue.

Please advise.

System specs: MacBook Pro (Retina, 15-inch, Mid 2015) • GPU Intel Iris Pro 1536 MB • OSX 10.14.6 • Illustrator 23.1.1

I have an Illustrator file (attached) which is originally imported from a dwg file but doesn't seem to contain that much artwork. Trying to open this file (or preview) with GPU either hangs Illustrator or takes minutes on end to render. The same thing happens if this file is placed in Indesign and GPU preview is on there, even recovering that document after force quitting hangs Indesign.

I can simply work around this problem by disabling GPU performance from prefs (or alternatively switching to preview on CPU, but then I need to initially open the file with GPU preview, which might hang the program). Just thought this info might be valuable for debugging.

OS: macOS High Sierra 10.13.6 Build 17G5019
2 x Xeon E5-2690 v4 CPUs (don't ask ;) )
64 GB RAM
NVIDIA GeForce GTX 1080 8191 MB
GPU Driver Version: 387.10.10.10.40.122
CUDA Driver Version: 418.105

Hi, I noticed a small rendering issue with strokes in GPU mode. The boundaries seem to be somewhat inaccurate, to the point that in certain situations (regardless of whether or not they're joined and by any method), suck as a tee shape, a small bulge of one stroke can appear beyond the edge of another, even though they shouldn't.

See attached pictures, the problem area is circled. It is subtle, but visible. There is a slight bulge extending outwards towards the right, presumably from the horizontal path at that junction. This is incorrect, the paths are joined and have identical stroke settings.

In CPU rendering, it renders correctly, and no bulge is visible. It seems to happen somewhat inconsistently, it doesn't always effect path junctions like that, only sometimes.

Also, the stroke width visibly changes slightly when switching between CPU and GPU mode. In my case, GPU mode seems to draw them slightly wider (higher stroke pt value) than it should be.

I wonder if this might be due to error introduced by using single precision floats on the GPU (which I assume is the case, considering how much lower double precision float performance is on most GPUs)? Who knows.

Regardless, the obvious workaround is to simply use CPU rendering, and it is relatively minor. But it is important to have an accurate representation of what you're doing.

Not clear this is actually GPU-related.
This bug dates back 32 years, all the way to Illustrator 1.0, when Adobe used the term "QuickDraw" to describe it. Terminology has changed, the bug has not. It has happened on every version of Illustrator, on every Mac, under every operating system.
I've sent the attached screenshots and videos in the past, no response.
The bug manifests as stray lines or incorrect vectors at certain seemingly-random resolutions.
In preview mode, in addition to above problems, (possibly a different bug), I often get sectors or areas that do not fill or redraw correctly. Sometimes a black rectangle where none should be, sometimes just blank white space.
sometimes some stray diagonal lines, often when I 'move around' in a document in preview mode, new areas do not "refresh".