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Èròjà atẹ̀lélànà yii ni a ti fi pamọ́ fọ́jọ́ pípẹ́. Jọ̀wọ́ béèrè ìbéèrè titun bí o bá nílò ìrànwọ́.

A website (like email or wiki) will load normally, and then immediately narrow to only take up the left half of the screen. Doesn't happen with all sites.

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I first noticed this when I loaded Yahoo mail, since though my browser window was about 85% of the width of my screen, the page itself loaded normally and then immediately shrunk down as if my browser was narrower. The same thing happens with pages on http://en.wikipedia.org/, and some others. This support page is fine, however.

In addition, the pages that show this problem also have had their default font changed. It might look like Tahoma, I think, even though my preference configuration is Arial.

I first noticed this when I loaded Yahoo mail, since though my browser window was about 85% of the width of my screen, the page itself loaded normally and then immediately shrunk down as if my browser was narrower. The same thing happens with pages on http://en.wikipedia.org/, and some others. This support page is fine, however. In addition, the pages that show this problem also have had their default font changed. It might look like Tahoma, I think, even though my preference configuration is Arial.

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Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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Thank you, cor-el, but that's something I already tried.

If anyone is interested in reading everything I've done so far, please click the "More system details" link to the right of my original post.