I suspect if you add some DOpus.Output ... debug logging into your scripts you might find one or both are being called over and over again, which is causing the toolbar flickering and other problems.
When you tried disabling the scripts, did you move both of them out of the script folder to somewhere else, then fully exiting Opus (via File / Exit Directory Opus) and restart it? If not, please try that to see if both problems are triggered by the script(s).