Got a random "Sender hasn't sent us the keys for this message" incoming message on Riot iOS during one of my 1-1 chats, so I fired up one of my riot web instances to check the room there, and instead was greeted with the message in the title (and messages that I could decrypt on iOS are not able to be decrypted on riot web). Logs will be attached to this issue.
Was having a conversation in a long-running e2ee 1-1 room with a friend from riot iOS, got an unable to decrypt, fired up riot web, got corrupt session errors.

riot iOS v0.10.4
riot-web develop (c3e6a3078958-react-73b177d07567-js-312976294b7e)
For the web app:
Also ran into this issue on chromium 80.0.3987.132. debug logs have been sent
I'm seeing this more and more as well...
Killed the riot-desktop application once, restored from key backup and then _most_ already received messages get decrypted successfully afterwards. But most new messages are again showing
** Unable to decrypt: The secure channel with the sender was corrupted. Trying to create a new secure channel and re-requesting the keys. **
. Re-importing an exported e2e keyset from device #2 (Android, which still works flawlessly) and importing with Device #1 does not change the fact.
Pressing the Re-request encrypted keys link does not do anything.
1.6.2
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Killed the
riot-desktopapplication once, restored from key backup and then _most_ already received messages get decrypted successfully afterwards. But most new messages are again showing. Re-importing an exported e2e keyset from device #2 (Android, which still works flawlessly) and importing with Device #1 does not change the fact.
Pressing the
Re-request encrypted keyslink does not do anything.1.6.2