I've been using a simple WYSIWYG editor called webpagemaker for a few years, quite succesfully.
However recently i saw my site plummit from around the 25 mark in google search to around 100, for my main keyword phrase.
When i use an nline site checker, quite a few minor errors seem to be showing. The site navigates and works fine on Firefox and IE, i was wondering if these issues could have affected my search ranking. However why would they suddenly casue an issue now?