thank you for your post. We just released version 1.6.0 (also supporting MySQL!). There were changes in the parser and I personally can reproduce your bug in 1.5.5, but not in 1.6.0. So you can update and check if it's ok.
it's a little embarassing, as I could not reproduce the missing highlight on your pictures. It may be a more specific bug. Please what is your configuration? And, looking at the screenshots, I have a question. The run/compile icon (top left) is disabled. How did you get it disabled? Is the connection off?