Inconsistent Content Widths

With the layout settings configured with all the defaults (16 column fixed grid, split sidebars, first and last sidebar widths of 180px.) the usable content area width changes depending upon which sidebar is populated with blocks. By usable content width I mean the actual area where the content appears without respect to padding and margins. Populating only the first sidebar gives a content width of 710px, whereas when populating only the last sidebar the content width changes to 700px.

Cycling through various other combinations of sidebar locations and with either or both sidebars populated with blocks results in other inconsistencies. One especially glaring one occurs when the sidebar layout is configured for both sidebars first. With the first sidebar populated the right-hand edge of the content area is flush with the edge of the theme width (960px). Adding a block to the last sidebar results in the right edge of the content area being indented 20px from the theme edge. This appears to be caused by the content area using the class .layout-first-main-last which seems to be incorrect for the sidebar location configured. A similar inconsistency occurs when the sidebars are configured for both last, with the left-hand edge of the content affected.

I’m sure it’s not possible to provide a content layout class for every conceivable combination of sidebar layout and perhaps this needs to be customized by the site developer for the specific site layout, with the hope that the end user doesn’t make changes, or at least doesn’t notice any inconsistencies.

I would like to add that I like all the Fusion themes and also working with the Fusion theming system.