Still having text input issue

I have been having this problem ever since I purchased my MacBook on June 10. Whenever I highlight text in any field on any window and try to type over it to replace it, it doesn't work until I click the cursor outside of the screen. As an example, if I am in Safari, or the Finder, or on iChat, if I typed in the word "apple" and I wanted to replace it with the word "orange", there are two ways I can do it. I can place the cursor after the word "apple" and click and hold the delete button, or I can highlight the entire word and retype "orange."

The problem is by doing the latter, or highlighting the word, when I begin to retype the word, it does not work! At least, until I click the cursor on the screen... anywhere on the screen. So, the highlighted word remains as it is even when I type a separate word and it will NOT change until I click the trackpad button somewhere on the screen or window.

This is becoming very annoying. My software and version of OSX is up-to-date.

Am I the only one having this problem, or was I pretty vague about it? It's a pretty difficult problem to describe, I guess.

If I understand your problem right it's as if it's waiting for some input from the mouse before letting you type when you use the highlight method?

And if so, I think i've had something like that happen once or twice on my MBP, but I didn't do anything to fix it.

Yes, that's a pretty accurate description of what's happening. When I highlight text, anything I type does not appear until there is input from my trackpad or the large button below it.

I figured out the problem. The "Drag lock (click to release)" feature is what's causing it. When I drag the cursor to highlight text, I need to click to release the highlight in order to make the changes. Who knew?