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Cannot open file by double clicking it

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Since upgrading to 6.0.2 I can't open a file by double clicking it. I get "There was a problem sending the command to the program." Also, clicking on a link in an email (Thunderbird) nothing happens.

Since upgrading to 6.0.2 I can't open a file by double clicking it. I get "There was a problem sending the command to the program." Also, clicking on a link in an email (Thunderbird) nothing happens.

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Sorry, restarting the computer seems to have fixed it.