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If you have views caching enabled, the themed form element output does not get regenerated for each page load. However, the hierarchical_select_process() #process function does get called for every page load. This seems to be where the $hsid is set.
The result is that the Form HTML, and what the Javascript is looking for go out of sync, with $hsid incrementing by one on every page load, with the actual HTML on the page not changing to reflect the new $hsid.
Comments
Comment #1
stefan.r CreditAttribution: stefan.r commented6.x issue without activity for over 3 years, closing.
Please reopen if this is still an issue in 7.x.