I've noticed that the most recent version of Keyword Tooltips is causing display errors with posted material (forums and blog posts but also Gallery comments).
When KT is enabled, a sentence like:
Here is another sentence, inside a blog post!!??
will display as:
Here is another sentence , inside a blog post !!??
even though the source code of the original post has none of these extraneous spaces.
I know KT is the culprit because I've troubleshot this by disabling/enabling all apps/plugins, and even restored my original editor button configuration until I found out what was going on.