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Thunderbird has started refusing to open emails, unless I open them in a new window. Why?

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Recently Moz Thunderbird has started refusing to open emails when I click on them, or links within emails...eg on an order, all complete but last step, which T'bird refuses to open. I am running XP (Yair I know) ...I have had Norton knock out Mozilla runtime several times recently, and have as a result had to re-install Firefox and T'bird on several occasions.

Any solution resulting in T'bird's customary reliability being restored welcomed.

Recently Moz Thunderbird has started refusing to open emails when I click on them, or links within emails...eg on an order, all complete but last step, which T'bird refuses to open. I am running XP (Yair I know) ...I have had Norton knock out Mozilla runtime several times recently, and have as a result had to re-install Firefox and T'bird on several occasions. Any solution resulting in T'bird's customary reliability being restored welcomed.

Chosen solution

godzillozzy, is it fixed?

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Try safe mode (Hold shift while you start Thunderbird.)

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Chosen Solution

godzillozzy, is it fixed?

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Safe mode made no difference. I fully deleted T'bird and re-installed, (yet again) and so far all is working. This time I avoided all add-ons.