If you see Develop in the Safari menu bar click Develop > Disable Images
That should un ✔. If you don't see Develop in menu, ignore this part.
Try emptying the Safari cache. Command + Option + E. Quit and relaunch Safari to test.
If that doesn't help, try troubleshooting Safari extensions and plugins.
From your Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that off if there are any installed. Quit and relaunch Safari to test. If that helped, turn extensions back on then uninstall one a time to test.
If it's not an extensions issue, try troubleshooting third party plug-ins.
Back to Safari > Preferences. This time select the Security tab. Deselect: Allow all other plug-ins. Quit and relaunch Safari to test.
If that made a difference, instructions for troubleshooting plugins here.
message edited by: cs