http://www.icyphoenix.com/viewtopic.php?f=35&t=6460&p=44318#p44318
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Mighty Gorgon
Sat 12 Sep, 2009 11:11

Re: IP 1.3.0.53a - Image Limit In Posts Is Not Dynamic?
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You need to edit CSS.

Find this class in the CSS used by your template:

[codeblock].post-text-hide-flow {
	overflow: auto;
	max-width: 960px;
}[/codeblock]

And remove any "width" related entry.

Please note that this class is also defined in [b]common.css[/b].