Solved the issue on my pc... running K-Meleon 1.54 on Vista 32bit Service Pack 2.
In the user-defined stylesheet paste the following:
.fb-comments{width: 100% !important;}
.fb-comments iframe[style]{width: 100% !important;}
.fb-like-box{width: 100% !important;}
.fb-like-box iframe[style]{width: 100% !important;}
.fb-comments span{width: 100% !important;}
.fb-comments iframe span[style]{width: 100% !important;}
.fb-like-box span{width: 100% !important;}
.fb-like-box iframe span[style]{width: 100% !important;}
.ego_column{display: none; !important;}
#rightCol {visibility:hidden}
#rightCol {width: 2% !important}
The important line is the last line - width: 2%... so if you still want the right column shown but not cutting off your games, just add that line and it should sort it out. I hide the whole column because it irritates me. Hope this helps