need to disconnect before disaling account
Steps to reproduce
Let's say you have two (or more) accounts, and you want to disable one.
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Have more than one account setup
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Make sure it's online
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Right click and choose "Modify Account" or Edit → Accounts
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Uncheck "Enable"
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See this:
You are currently connected to the server To disable the account, you must be disconnected.
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Set it to offline and repeat step 4
Perhaps just disconnect, or ask if this is to be done.