iMac screen flashes black in Photoshop CC

Hello

I am posting this as well in CC Adobe and Apple forums as I do not know where the problem lies, but I would really appreciate this problem:

I use Adobe apps on an iMac CC brand new (still in time to get the full refund). If you use Photoshop CC (2015.5) the entire screen (not only the Photoshop window) goes black for about half a second when any icon tool exceeding a certain size of pixel passes of the tool to the pointer icon icon or vice versa.

This happens for example when the icon of the fate of the area of the image on the menus or the dashboard or window, or when it comes in and out of the right click menu change brush size. Any situation when running the tool pointer or pointer tool. It does not always happen, but it happens most of the time, maybe the type of pointer movement has something to do with it, well it happens with fast or slow transitions.

The problem only occurs when the brush is superior to certain dimensions - never when it is less than the critical size. The critical size may vary depending on whether the Photoshop was opened for a while or just launched (I don't know too much about). There is also an interaction with the hardness of the tool.

Thus, for example:

On the blur to 0% hardness tool, the screen flashes black when will top 80 pixels-never less than size. 100% hardness, it flashes from 64 pixels. Same for the Brush tool, Eraser, etc. I think it happens with any appreciable tool (don't have not tried them all).

I use a Wacom Intuos PS and the Magic Mouse from Apple. The problem occurs at the same time if they are both connected together or separately.

The problem occurs even when Photoshop is the only application running.

Please help, because it is almost unusable now.

Specifications of the computer:

iMac, retina 4 k, 21, 5-inch

Processor: Intel Core i5 to 3.1 GHz

Memory: 8 GB 1867 MHz DDR3

Graphics card: Intel Pro Iris Graphics 6200 1536 MB

The Photoshop memory usage is set to default values:

4500MB (70% of available memory)

4 levels of cache

Tile size 1024K cache

I just downloaded and tried the oldest version of Photoshop - CS6 - available through my driver's license and the problem is exactly the same, this is not limited to a particular version of the CC in Photoshop.

Tags: Mac OS & System Software

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