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How to get rid of the pop-in message "plugin-container.app needs to download the font "Osaka"?

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I started to get this message when I opened one attachment in the received email in the Mail on my Macbook Pro. I opted for Skip, but it kept popping-in, so I chose Download (there were only two options), it downloaded the file after a while in the unusual format, so I thought it would be the end of the matter. I restarted my laptop, but the message still pops in. I deleted the attachment I saved, but it keeps doing. Please help me to get rid of it altogether. Thank you. Lucy Heron

I started to get this message when I opened one attachment in the received email in the Mail on my Macbook Pro. I opted for Skip, but it kept popping-in, so I chose Download (there were only two options), it downloaded the file after a while in the unusual format, so I thought it would be the end of the matter. I restarted my laptop, but the message still pops in. I deleted the attachment I saved, but it keeps doing. Please help me to get rid of it altogether. Thank you. Lucy Heron

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Hi, unfortunately this seems to be an unresolved bug which hopefully will be fixed in a later update.