I started playing around with it to see if I could reproduce, this was all done using Ethereum mainnet only.
Steps to reproduce problem:
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install metamask
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connect Trezor1
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go through the trezor1 login process
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select account you want to use
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all good to this point
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disconnect wallet from PC
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reconnect wallet to PC
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click on “Connect Hardware Wallet”
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screen with greyed-out box is displayed
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restart PC
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open Metamask and enter password
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connect Trezor1 and click on “Connect Hardware Wallet”
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screen with greyed-out box is displayed
It seems the only fix now is to reinstall Metamask. Is it possible to download an older version of Metamask to compare the behaviour? As someone else mentioned, it only started happening in the last couple of weeks. I’m not convinced it’s actually a Metamask problem, there could be many causes - other updates, Trezor Bridge driver, some MS thing, who knows… Is there some kind of log generated by Metamask that would help troubleshoot? I also tried disconnecting the Trezor, disabling the driver, re-enabling the driver, then reconnecting the Trezor but that didn’t do anything.
UPDATE: I found that by switching to a Ledger, it connects, but it is also capable of displaying the greyed-out box. But I found a work-a-around, in that when the Trezor is reconnected, there is no greyed-out box until disconnecting from the PC and reconnecting…