Yahoo has a new format. Here are several things you should know and do:
Selecting small table before you enter a room makes more room for dialog on table. Or you can just change your screen resolution by going to properties on your desktop, then settings and slide just a tiny bit from 800x600 to 1024x768 and switch it back when you finish playing.
If the problems you're experiencing with Yahoo! Games include:
getting a blank screen
nothing occurring when you try to join a table
any similar problem
Make sure that the "Enable Java" box is checked.(under tools on browser choose internet options then advanced)
Internet Explorer 5 for Macintosh OS X
Select "Preferences" from the "Explorer" menu.
Select "Java" from the left navigation bar.
Place a check-mark next to "Enable Java."
http://java.sun.com/ .........To install latest version
You need analyze for defragment. And increase your memory if you keep losing your connection while playing. (under tools tab click on internet options, then settings, then advanced, needs to be 526 or higher.)
You may also want to clear your cache (history) or browser or on internet options and restart your browser.
If you have a pop-up blocker click on it, Click on always allow and add https://www.yahoo.games .
You cannot chat in yahoo anymore except on table and in lobby.
Shove-it backdoor isn't working right now either so use Amish Donkey.com backdoor
If you continue to have problems, double-check your computer's compatibility with Yahoo! Games.
Yahoo has a spam chip now so if you move around too much, get booted from tables too much or get invited too much, it will mistake you for spam and bar you from games for 24, 48 and 72 hrs.
I hope this helps you out.
Source(s) Yahoo Games help pages and exploring