Cellular Overview using ptwww doesn't work

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Using both Ubuntu 20 and OS X 12.3 hosting a ptwww instance (either ptools v25.5 or v26), when the Cellular Overview menu item is clicked, the system returns This page isn’t working right now. If the problem continues, contact the site owner. HTTP ERROR 400. Using desktop ptools, the cellular overview page functions correctly. I've run into the same problem on multiple instances, including https://pathwaytools.scinet.usda.gov (v 24.5). This problem is present in all my PGDBs. Suggestions for correcting? Thanks.