Matt, no need to change values within the database. All you need is any browser add on that allows to inspect and edit HTML&styles. I personally user Firebug for Firefox browser.
1. Open permissions page in Firefox and open Firebug (use F12 to open Firebug). Click on the cursor image in the left corner of Firebug.
2. Once the cursor is clicked on, hover over the permissions page, a little bit above the "Save" button. Firebug will select following area ( selected area will be within the green borders)
3. Then, click on the following <div> element ( click exactly on <div> word)
4. Once you click on it, the right column of the Firebug will show you styles selected element has.
Find:
.ow_superwide {
overflow: hidden; width: 75%;
Click twice on
75%; and change this to, for example 255%;
5. The width will change right away, and all you will need to do is to scroll to the needed user role and check needed check boxes. Once you are done click "Save". Your changes will be saved and the site will get back to normal.