Does this also happen for the field in profile edit? Are you applying any conditions to the field using CB Conditional? Was "Minimum Select" configured under Parameters > Validation (default 0)?
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Strange, seams to work fine in my tests. Was the field always a multi-checkbox field or was it changed from another fieldtype? Are there any conditions on the tab that the field is on? If the tab becomes inaccessible the field will also fail to save.
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Yeah changing a fields type can cause odd issues when it tries to migrate data. You'll sometimes need to run the strict type tool in CB > Tools to fix that if you toggle a fields type around too much.
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