Newly Installed Power Servers Not Showing In GUI Menu

Hello, I have an established LPAR2RRD install running version 7.70, and am having troubles getting two new Power servers to show up in the GUI. They are attached to an HMC, and data collection is turned on with a sample rate of 60 seconds. From what I can tell in the LPAR2RRD logs and directories, data appears to be being collected from both servers, but for some reason the new servers have not been added to the GUI menu. Is there a trick I'm missing to get them to appear? I've tried different browsers and clearing out my browser cache. Thank you for your help!