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Every four or five seconds the spinning ball frustratingly interrupts the reading and writing of emails in Thunderbird. [Mac OS X 10_12_6]

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The problem didn't happen initially and seems to be slowly increasing in regularity.

I can type whilst the ball is spinning but the type won't display until the ball stops spinning.

It happens when composing, opening emails, opening attachments and I suspect, when sending, because often, the emails fail to send, presumably when whatever is happening coincides with clicking 'send'.

I am using Safari 10.1.2 on a MacBook Pro.

The problem didn't happen initially and seems to be slowly increasing in regularity. I can type whilst the ball is spinning but the type won't display until the ball stops spinning. It happens when composing, opening emails, opening attachments and I suspect, when sending, because often, the emails fail to send, presumably when whatever is happening coincides with clicking 'send'. I am using Safari 10.1.2 on a MacBook Pro.

Modified by Wayne Mery

All Replies (2)

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> often, the emails fail to send, presumably when whatever is happening coincides with clicking 'send'.

Can you post a screen shot of what you see when this happens?

Also, does situation improve if you start Thunderbird in safe mode?

https://support.mozilla.org/en-US/kb/safe-mode-thunderbird
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Hello Wayne,

Thanks for getting back to me.

Tried your safe mode suggestion and things worked much better. The only add on I was using was a Font Resizer which I rather liked.

Also, I only experienced the problem on this Mac Book. Everything worked fine on a Mac Pro and a Lenovo PC.

Thanks for your help.

Cheers,

Paul