Can't finish previewing. There isn't enough memory

I am having this same problem. New iMac purchased less than a month ago. Getting the same message (Error  with GPU processor) followed by second message (not enough memory). Any ideas?

Got it as well, I am not having an intense or heavy illustrator file open, at some random point this just pops up for literally no reason.

why is nothing being done about it and why are we not being helped??

Seems unlikely to me that it should happen under these circumstances.
Can we get some support on this please anyone?

Thank you in advance.

Same here. It just happens at random moments. Sometimes they're not even memory intensive moments.

This problem has been popping up since December 2015 with new and old files. Before I could handle complex and simple files without any problems. Not really sure if it's an Adobe or OS X thing.

Any ideas Adobe?

MacBook Air 5.1

2 GHz Intel Core i7

8GB RAM 1600 MHz DDR3

OS X 10.11.3

I have also recently started experiencing this issue.

Even if I only open one simple document since booting that has been left open for a while.

Also have to quit and relaunch to solve.

Illustrator CC 2015.2.1

OS X 10.11.2

Memory: 8 GB 1600 MHz DDR3

I am tearing out my hair trying to work in Illustrator CC 2015. I'm working on a very small file that should not have any type of memory issues on my brand new Mac Book Pro with 16GB of RAM. I've had to restart Illustrator like 10 times today. WHAT.THE.F#%@ Adobe?? This never happened with my CS6, why is there such a major bug in a later version?? Please respond to this thread with support. Why are we paying for this product monthly until the end of time if it's WORSE than your pre-cloud version?

Having the same issue here.  New iMac, 16gb of RAM, and the latest AI crashes with memory errors all the time, while working in all kinds of files.  I "upgraded" from an old iMac and CS5--despite having just 4gb RAM on that system I never once had memory problems like this.  It's incredibly frustrating.

In the mean time, about 3,5 years later:

(Adobe Illustrator CC 2015 / 19.2.1)

Illustrator was doing this to me

Turned out there was a file type (a .jpeg) placed in the doc that it couldn't read

Once I deleted the image,

I did cmd+Y and everything returned to normal

I opened up the .jpeg in Photoshop and saved it as a new file type and dragged it back into the file.

This memory issue was fixed in CS6. Ai CS6 is natively 64 bit and uses complete RAM installed in your PC. Your artwork could be very complex due to which Illustrator is running out of memory while previewing the artwrok during switching from Outline to Preview. If you're using an earlier version of Ai, then it will only use 3.75 GB of your total RAM installed. With this much amount of RAM being utilized and depending on the complexity of the artwork, you have to either move your artwork to a machine where only 4 GB of RAM is installed or upgrade your software to native 64 bit Ai CS6.