I did mention issue to URC support prior to starting the thread. They said they haven't heard of this problem before and recorded the issue in their database.

It's my understanding that CCP can convert MX-980 RCF files, but the MX-980 editor cannot convert CCP files. This makes it awkward to downgrade to the MX-980 editor.

I've found that lag only occurs on the specific page for the device that has the clock. So my workaround has been to duplicate pages -- one page with clock and one page without. I primarily live on the no clock page. If I want to view the time, I can press a soft button, which causes me to jump to the with clock page for 3 seconds, so the time displays for 3 seconds, then I jump back to the no lag page. Or I can press the page+ button, and move to the with clock page, so the time permanently displays, but lag is present on all buttons.