If, following an update to Simple:Press your forum display becomes unformatted then please check the following:
The above actions will normally resolve such an issue.
If you are using a custom theme (and not a child theme), and one which is based upon ‘Default’, ‘Stacked’, ‘iForum’, ‘Unified’ or ‘Reboot’ then it might be that you will need to make an edit to the main theme CSS (php) file. This has become necessary due to a possible security issue. Open the file in your editor (you can use the editor in the forum admin > Themes section for this) and look at the top of the file.
You should see a comment near the top that reads: ‘# load the selected color overlay stylesheet‘. Underneath there should be two lines of code exactly as the following:
$overlay = dirname(__FILE__) . '/../../' . $_GET['theme'] . '/styles/overlays/' . $_GET['overlay'] . '.php'; include($overlay);
If the code in your file is NOT the same then please replace it with the above and we apologise for the change. It was, as stated, due to a security issue.
We would also recommend that you consider changing your custom theme to a child theme which would avoid such issues in the future. Child Theme frameworks for all of our themes are now available on our download pages.