There has been no indication that this has been fixed in the recent update, they must still be trying to figure it out.
I saw blue squares in 1.55 today, was with Coco and coming out of the underwater tunnel at night.
Red and blue ones here too. Seem to be particularly bad at course junctions (so where the new coastal road leaves to head out the jungle it was like a disco today)
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There’s also a variant of this (since the update before last) where squares appear (and flicker) simultaneously at the bottom and the top of the screen.
idk if it is a separate thing or just another manifestation of the same issue: When riding the climb portal, the difficulty indicators do not always fill the entire projection area and are displayed “tiled” instead of “stretched”. Looks to me like someone tried to reduce computation impact of properly scaling these in three dimensions and the rendering plane isn’t cropped properly. It only seems to appear for riders in the same “steering lane”.
Just a wild guess: I think the other squares could be the same thing. Some sort of visual cue that should be rendered in a plane parallel to the monitor, where what is to be shown isn’t properly sized (and potentially repeated or stretched). Things appearing here and there hint, that what is breaking stuff is actually added incrementally. That’s what makes me think it might be over-eager “optimization” 
I got them for the first time at the top central part of the screen today. Up until now it was only over my avatar.
Still happening with 1.56
I got yellow squares from someone in yellow kit and they had weird black pixels on their shirt
I also have black to red flashing squares.
I recently bought a 1440P 165 Hz monitor and upgraded from an older 1080P 144 Hz panel. I didn’t have the squares before the swap, so I first tried swapping displayport cables and concluded the monitor was faulty and sent it back.
I found this thread after a replacement monitor has the same problem. I’m pretty annoyed to find the fault turns out to be Zwift.
I’ve been getting this since last year too. Intermittent and nothing particularly seems to trigger it. I only notice it on me and not on anyone else. Only just noticed this post, so a bit late to the party 
I’ve been having this issue for months now, but it has never been as bad as it was yesterday. I did the DIRT Badge Hunters ride on Spiralling in to the Volcano, followed by the Zwift Games race on Loop de Loop. The dark red squares are always centred on the riders bikes rear lights when it gets dark. Not just my bike, but other riders too.
Running Zwift on Windows 10 PC with 4th I3 processor and Nvidia Geforce GTX1650.
Issue is still here. Got a black square in Scotland just a few minutes into a ride, it was not night time when it happened. 1.60, PC. On the upside I didn’t see any red squares at night, though it wasn’t a huge group.
Hi folks, we’ve made a few changes in game update 1.60 that we hope will reduce these issues, and we’re continuing to dig into this issue further.
If you do experience any colored square issues after updating to 1.60, please share here, along with the following information if possible:
- Game version
- OS (e.g. Windows 11)
- Graphics card (e.g. Nvidia Geforce 3080)
- If you happen to catch it with a video or photo, that’s also super helpful
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@calfzilla Thanks for reporting - do you recall any of the details surrounding the black square’s appearance? E.g. Did it appear to be originating from any specific item or place? With red squares, many instances appeared to originate from tail lights.
I only noticed it one time, it was from the back of a bike, I think. Somewhere in this portion of the map. W11, i5-10something, 1660. I’d have grabbed a video screenshot but that hurts performance too much so I have it disabled.
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Win 10
i12,100f
GTX980
Zwift update to 1.60
Had 1 red box warming up with Maria on tick tock. At least 2 issues in Titans grove in the race (before zwift shut down on me 3km from the finish - but I’ll raise that elsewhere!!!)
Second one is 13:24 on the video (but I can’t grab a screenshot)
This will go into the “maybe” category. I have 1.60 and I think I saw red squares on the downhill from Titans Grove in today’s Zwift Games, but I was looking at my phone changing songs and only saw this out of the corner of my eyes. Will keep a lookout for this issue and report back if I can verify it still happening.
Still plenty of black box flickers in various areas during the Elite Games Epic Race; still emanating from the brake lights on several bikes.
Win 10
13700F
3060Ti
32Gb RAM
Lots of black squares popping up riding through the desert oasis with Miguel this afternoon. As usual centered around the bikes rear lights.