Same Problem here with the PB 623 (FW 4.4.614, no other updates avaiable) aka Touch Lux 2.
Got some error messages during dropbox sync an therefore tried to reconnect the account. Cannot push the "Sign in" button in the browser. Nothing happens.
Quote:
[...]
As alterative we recommend other methods of copying files: Send-To-Pocketbook, download from web browser, copy via USB cable from computer.
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Syncing is one of the major feature of modern devices.
The problem is not having a cable lying around but keeping a lot of devices in sync and switching between these at different places in everyday usage.
Just my 2 cents.
Best wishes getting fixed this issue