This condition may occur when a plugin conflict exists, or, when some of the custom code you added is not properly written.
Let's take two steps to find the problem.
First, deactivate all plugins except Akismet and anything found at PageLines.com. Don't worry about losing formatting, data or anything. Deactivating is only like turning off a lightswitch - you can restart anytime without losing anything. After deactivating, check the Simple CSS Lite and Color Control settings, and make sure you're adding the colors correctly. To make something black, for example, you should enter #000000 and not 000000. Remember to scroll up or down and click the blue Save Options button. If the problem is resolved, reactivate your plugins, one at a time, testing CSS Lite each time. When it breaks again, the one last activated is the problem plugin and should be replaced. It may be incompatible, out of date or just broken.
Next, let's go to Dashboard > PageLines > Site Options > Custom Code. Copy the custom code you've entered, then go to this link:
. Click the "By direct input" tab and paste the code. Click the "Check" button, and it will tell you if your CSS is actually incorrect or not, telling you where any errors occur. If errors exist, fix them accordingly, replacing your original code with corrected code. Save Options again, and test the CSS Lite options as described above.
Let us know if this resolves your issue.