Can't login to Telegram after update

[frozenspider]

I updated Telegram Desktop for Windows from 0.8.57 to 0.9.15 using downloadable installer, and now I can't login. Upon startup it briefly shows me my contact list, and then it's replaced by relogin screen prompting me for my phone number and confirmation code. After I input both, it once again shows me my contact list for a split second before returning me to login screen.
Tried to relogin 5 times already.
Reinstalling 0.8.57 back didn't help, neither did deleting tdata folder in Telegram install folder.
Here's the content of log.txt in Telegram folder:

[2015.12.14 06:49:36] App Info: reading settings..
[2015.12.14 06:49:36] App Info: reading encrypted settings..
[2015.12.14 06:49:36] Audio init time: 20
[2015.12.14 06:49:36] App Info: reading map..
[2015.12.14 06:49:36] App Info: reading encrypted map..
[2015.12.14 06:49:36] App Info: reading encrypted mtp data..
[2015.12.14 06:49:36] Map read time: 2
[2015.12.14 06:50:03] RPC Error: request 18 got fail with code 400, error AUTH_BYTES_INVALID
[2015.12.14 06:50:04] RPC Error: request 20 got fail with code 401, error AUTH_KEY_UNREGISTERED

[frozenspider]

Any help?

[frozenspider]

I ran it again for the first time after all this time and it suddenly worked. Could you please consider adding some additional logging to trace this problem in case it appears again?

[stek29]

Have you experienced this issue again?

[frozenspider]

No, but I haven't updated since.

[frozenspider]

So, you won't even consider adding logs? You don't consider this to be a reasonable request?

[stek29]

@frozenspider Does Portable version work?

[frozenspider]

Right now it does, but then again, so does the desktop version. Haven't tried it at the time bug was happening.

[github-actions]

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