Search results return empty screen on dashboard but upper left side shows "1 of 1" or "1 of 5" (depending on what is being searched).
Please revert UI macro "kb_search_results_v3" to out of the box to resolve issue. Please follow below steps:
--Navigate System UI > UI Macro
--Filter by [Name][is][kb_search_results_v3]
--Open the record and right click on header and navigate to Export > XML, download it
--Under Version related list right click on out of the box record and select revert to this version