Start11 v2, 4 monitors, missing start button on one monitor

Hi,  

I have Start11 v2 installed, enhanced taskbar, center aligned on a pc with 4 monitors.  On one monitor, the taskbar is missing the start button, search button and desktop button, in addition to the date/time.  

Three monitors look like this:

Fourth one looks like this:

If I change to Left start button and center aligned taskbar buttons (or left aligned), it shows on the fourth monitor.  As soon as I change back to Center aligned it goes away again.

Any ideas to fix it?

Thanks,
David