When renaming a table alias, or a variable, sometimes you want to rename it to something and SQL Prompt will intercept the return key (to accept the rename) and "auto correct" it - for example, this morning I wanted to change a table alias to "l" and it auto corrected this to "LEFT", so I had to change it back and press enter again.

It's not a big thing, just it happens quite a lot and can be aggravating.