I am on Windows Server 2012.
You may have to find your dispatch folder , in my case here 😧 splunk var run splunk dispatch .
And manually delete directories or move them to your old-dispatch-jobs folder (you need to create that).
Because the CLI did not delete quite a few of mine.
After I manually deleted 'miraculously' SPLUNK started to render searches and dashboards correctly again.
At this stage I would guess that my creation of real time alert yesterday caused the issue but unclear why.
Hope this helps someone.
ps - Is there a document on good housekeeping for SPLUNK ?
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