FrankyBoy, Thomas Lange, Ben, Nathan Y, I recommend that you open support tickets and provide Detailed EAS logs from when you upgraded and the affected user(s) so that we review the traffic between the server and client devices.
Nathan Y, I am unfamiliar with the Boxer app, but will install this on multiple EAS clients to assess have it behaves.
In nearly all cases that we've encountered, the devices themselves have resolved the issue whenever it did a folder resync, all items were pulled afresh. In certain cases, the following steps resolved the issue if it didn't self-correct:
- Remove the account from the device;
- Remove the device from the Synchronized devices page in User settings > Connectivity > Synchronized Devices (this step cannot be skipped); and,
- Re-add the account on the device.