Try the following steps:

1. Make sure to update your browser to the latest version. You can find more information on how to do this by reading the article provided here.

2. Clear your browser's cache. Follow the instructions in the article linked here to clear your browser's cache.

3. Uninstall Prospector and then reinstall it. You can remove Prospector from Chrome and add it again by following this link.

4. Completely close your browser and reopen it.

If these steps do not resolve the issue, check if you have any additional browser extensions installed. Disable them one by one to identify which extension might be blocking Prospector's functionality. Also, check if you are using a VPN, as it can also impact the plugin's operation.