"Medium" font size has gone away... I get the same small font size if I pick "small" or "medium" size.?

[greatcherry797]

How can I get the medium font size back???

[Trooper63]

Easiest way to increase/decrease the size of your font is to hold down the CTRL button...lower left..and rotate the wheel on your mouse forward to increase it and rotate it backwards to decrease
You can also accomplish this by holding down the CTRL button on your key board and clicking on the plus "+" sign to increase the size or click on the minus "_" sign to decrease it..

...MORE OPTIONS
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When in the NEW/FORWARD/REPLY mode you can click on "Tt" (different fonts) or the icon just to the right (double T..one is smaller) for changing the font size. These are located in the long list of icons above your text area.(Older formt)
In the NEWEST format clicking on "Tt" will provide the different fonts AND size of the font. They are at the bottom of the email.
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One of the easiest ways is to click on the GEAR....upper
right....while in the INBOX view....clicking on SETTINGS, then WRITING EMAIL....you have 4 options on the right
between Small and Extra Large. You can bring those up
by clicking on the down arrow on the right side of the box.
Click SAVE when done
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If you are asking about changing the fonts of entire yahoo email view try clicking on TOOLS at the top of your screen and then CONTENT. Depending what Yahoo you are in...IE:Firefox..you might have to click on Tools..Internet Options and then CONTENT...You can do many things with the FONT. You will have to experiment. Click on OK when done..
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These links contain links that reference fonts
http://help.yahoo.com/kb/index?page=answ...r%20emails

http://help.yahoo.com/kb/index?page=answ...%20macbook

http://help.yahoo.com/kb/index?page=answ...ont%20size

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GOOGLE
Click on the three vertical lines....upper right
Click on settings
Click on SHOW ADVANCED SETTINGS
Go to WEB CONTENT....change it there
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the links within ref Macbook
http://search.yahoo.com/search?ei=utf-8&...
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[PopEye]

I can't duplicate the problem. I tried full featured Yahoo Mail (Compose) with IE 11, Firefox 28 and Google Chrome 33. I assume you are using Tt on the rich text formatting toolbar.
The default font is Modern. Try using a different font.