Any other SAFARI users having problems with GOOGLE searches?

For some weird reason am having Google coming back with 'no results found' when performing some routine searches through both the Safari browser and the Google website.

Have no idea if I somehow managed to accidentally initiate some sort of unwanted 'Safe Search' option, but seemingly unable to switch it off, even if I have.

I tried restarting computer, but no change. The searches can be performed successfully through (e.g.) Yahoo browser, but I want Google and normal functionality back.

Any ideas???