After upgrading to the latest version on 23-04-2021, when starting Zwift on OSX it keeps on telling me to restart:
“Something went wrong. Please try restarting Zwift.”
It will only work if I startup without Wifi, start Wifi when the Zwift login screen pops up. After logging in everything working fine as normal. But after a ride and restarting Zwift again, same issue again.
From the launcher_log.txt:
[21:43:35 2021-04-23] Patcher: Local Launcher version is “1.0.7”.
[21:43:35 2021-04-23] Patcher: Server Launcher version is “1.0.5”.
[21:43:35 2021-04-23] Patcher: Launcher URL for updating self is
[21:43:35 2021-04-23] Patcher: No update available, deleting temp files…
[21:43:35 2021-04-23] Launcher: Calling Update Launcher Check
[21:43:35 2021-04-23] Launcher: Calling Update Process Available
[21:43:35 2021-04-23] Launcher: Update Not Found.
[21:43:35 2021-04-23] Launcher: Webview loaded some URL.
[21:43:36 2021-04-23] Launcher: Webview loaded some URL.
…
Anyone any idea what the issue is?
Did some debugging and cleared safari cache/cookies a couple of times and all of a sudden no more 40X with the /launcher/?state
Had to login again and working fine now.
But when I repeat clearing cache/cookies in Safari I can always login without providing username/password and when looking at the first couple of requests cookies are being set in the outgoing request so not sure this Safari cleanup did the trick. 
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I was using Microsoft Edge and had a similar problem. Reinstalled using Chrome. Works fine.
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What? Zwift doesn’t use Chrome at alll under ANY circumstance, on a Windows PC it uses Internet Explorer.
I don’t know why it worked Paul. Zwift stopped working on my PC, I tried to reinstall it using the Edge browser, it failed 3 times. I tried a reinstall using the Chrome browser and it worked and still works.
The same for me on two MacBooks. I switched from one to another after first time. Now it’s broken also on second. What a destroying my willingness of doing FTP test today. Googling instead of riding.
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turn wifi off, launch zwift, click yes to continue loading even though you’re offline then as it starts to load turn wifi back on.
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Yes, it helped. I’ve found this in one of previous comments. But going this way I will need do this every time. And I’m afraid it will never download update which fixes this issue. That’s the problem.
I have the same problem. Could not start Zwift. Tried the tip turning off WIFI but it did not work.
Any idea?
Thanks
Clearing cookies etc on MS Edge finally solved it. I had previously tried re-installing, updating drivers, clearing cookies on chrome, etc, etc. what a pain.
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this worked for me thanks Paul, top banana
had to clean everything, but i think the kicker is cached web passwords. which could be a pain for some. once i had to log in it worked as i only cleared the other data to no avail first
So since the last update iv managed to log onto zwift once, apart from that something went wrong please try restarting zwift. cleared browser data in microsoft edge, google chrome and reinstalled still same issue.
I had this problem this morning tried all of the above with out much success.
Ended up completely removing Zwift from my laptop and all associated cookies from explorer, then full reinstall. It showed up the same but this time did a major update that took half an hour. Now seems to work.
I’ve lost patience with it so I’m not bothering to ride this morning and seriously considering dropping my Zwift account. Why is it that every time they do an update nothing works properly 
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same issue with me… last time I was able to ride was last 3 days ago, now this popped up, I cannot log anymore… I tried the running the app when wifi is off (read on previous thread), but seems not working on my end still. I tried to reinstall the app 2-3 times i think. tried to tick on/off my firewall (just in case) but still to no avail. any other solutions?
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Same issue today here. Clear Safari History and it works.
J.
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