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This happened about the same time as the internal server error that I got:
https://project-gc.com/qa/?qa=16477/status-500-on-map-compare-with-custom-filter
This may suggest that the root cause is the same, namely "an effect of an unplanned reboot of the site":
https://project-gc.com/qa/?qa=16482/is-advanced-search-not-working-tonight&show=16487#a16487
Does the problem still persist ?