I experienced something along those lines, what happened what I went to use a bot, and got to the GUI but decided I didn't want to use the script anymore, so I clicked [x] and then stop. Having never fully loaded the script I found that I could not use the green play button to launch a new script. It actually locked me out of all interfaces of the bot. I had to relaunch 1.7.53 after a task manager kill, my resolve to the problem was to, even if I selected a script and changed my mind, go through everything to the point where it actually starts, then stop the script normally. I was able to open the script selector back up after letting an accidental choice run for all of about 3 seconds before killing it.
Hope this helps anyone having the problem!
Proskill