That's a broken filter, not gadget. You'll need to get the owner of the dashboard to edit it, check which filter it uses and then find the owner of that filter and get them to correc it.
The user doesn't know this anymore.
Fact is that this gone because of the upgrade,,,
It was probably not the upgrade directly.
What I think is most likely to have happened is you have a field provided by an add-on. The add-on is not compatible with 7.4, so the field is no longer working.
The filter your gadget is using references that field. Hence you now have an invalid filter, which cascades back into anything that uses it.
"The user doesn't know this any more" is irrelevant - the owner of the dashboard can correct the gadget by selecting a working filter, or the owner of the filter can edit it to remove the broken field.
Also, your admins can establish who both of those people are, and if they've left, change the ownership and fix the filter themselves. They should also be lokoing into where else a broken field might be having an impact.
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