The "blank report" issue is back after updating to vscode 1.49.x.
It still happens to me (Linux, VSCode v1.49.1 and Solidity Metrics v0.0.11). Closing and opening didn’t help, the workaround I used was to right-click on blank metrics tab, then “Export current metrics report” and then open the generated html file with a browser.
The "blank report" issue is back after updating to vscode 1.49.x.
Originally posted by @bingen in https://github.com/ConsenSys/vscode-solidity-metrics/issues/1#issuecomment-697303152