Might help to post your browser and version you are running so it can try to be recreated.
Minor forums bug
I'm using the latest version of chrome. This problem occasionally showed up in the previous version (before the makeover) as well.
Here's a picture, but I don't know how much it helps. The red arrow is pointing to my actual cursor, but the blue one points at the "ghost" cursor. The "real" cursor blinked like normal, but the "ghost" one looked frozen, exactly as shown in the picture below. Pressing "backspace" one time deleted the entire word, "What", leaving the blinking cursor at the end of the previous line. (The word "What" was the start of a new paragraph, since I had hit the Enter button right before the problem.)

Chrome, latest version. I'm running Windows 7 on a Toshiba Portege tablet. The computer's not at the top of the market, but I don't consider it anywhere near slow or laggy.
Caught the sucker again! This time, it happened when I entered a new line, typed quickly, and deleted quickly. I'm a fan of keyboard shortcuts, and I tend to delete entire words at a time with the combination ctrl + Backspace, which works in Microsoft Word, too. Anyhow, after deleting a couple words in that manner, the ghost image showed up, and stayed there until I hit another keystroke. I didn't delete this time, but simply pressed the spacebar to make it go away. Here's a screenshot.


Just a heads up: occasionally, when I type a long post in the forums and then delete part of what I type, an image of the text stays, even though it's not really there. After deleting more text, all of the "ghost" text disappears, fixing the problem. This bug doesn't really cause many problems, but I thought it would be a good idea to report it.