I can now add capitals to thread titles and toindividual post titles.
Thanks once again Grant for helping out. I am much obliged.
I just had a thought. I wonder whether the fact that I can now use capitals without problems in thread titles is because I switched over to "Full Enhanched Interface -- Full WYSIWYG Editing. Many of the former problems I had are no longer problems.
Adding extra spaces between words (I just put 5 spaces between the word "words" and the opening parenthesis) still seems to be a problem. As you can see no extra spaces.