Dreamfleet Boeing 727 Instrument Display Malfunction

I would like to upload attachments on this forum, but the system does not appear to be working. I haven't received very useful assistance from the Dreamfleets forum. I am getting a blank screen where the electronic VSI is supposed to appear. I was told by the Dreamfleet forum to check the 'electricals.' I've been racking my mind ever since, trying to troubleshoot. The blank VSI screen seem to indicate the only instrument not working properly. Everything else seems to be operating O.K. I've tried the uninstall/ reinstall option. Does anyone else on this forum fly the Dreamfleet 727? Any suggestions would be greatly appreciated.