First suggest turn off the "code completion plugin".
Second suggest if that fails turn off all plugins except for the compiler plugin.
Edit: If the problem goes away turn the plugins on one by one to locate the cause.
else the problem is in the main program, sdk, or compiler plugin.
Once the plugin causing the issue is located, ask for suggestions to fix the issue.
Or, post more information on possible causes of the issue.
Edit2: The CB version and OS information likely would help us help you!
Tim S.