Metric Data in Dashboard no longer pulls in Symbols from Sheet summary

sultan
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Has anybody had this happen to their dashboards? I've come back over the new years and all of my metric widgets now show "Source sheet not available"
I've tried recreating the widgets and even used other summary formulas from the same sheet and they do pull through. It looks like symbols are the only thing that won't pull through
Any help is much appreciated here
Thanks
Answers
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I was having this issue and called SS support. They had to look at the back end to figure out where the break occurred. I would suggest calling the support team.