With Apple Safari (Actual Version 4.0.5) Hierarchical Select produced "Received an invalid response from the server."
With Version 6.x-3.0 there was no problem.

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klonos’s picture

klonos
he/him
Primary language English
Location 90% Melbourne, Australia - 10% Larissa, Greece
commented
Status: Active » Closed (duplicate)

Please check for already reported issues before posting new ones. It helps keeping the issue queue clean and the module developers sane ;)

Please, report your case here: #538022: JS alert: "Received an invalid response from the server."