Tool Help

for some reason when i try to click the ground (or any where else of the world) none of my tools shoot
for example if i want to weld something to the ground, i get my weld tool out click the prop and try to click the ground but it doesnt shoot nothing happens! and if i want an npc spawn platform i first have to spawn a prop (or anthing) and click the prop instead of the ground please help!

Reinstall the game

i tried but im tryin to look through my addons (luckily which ive archived the zipped folders by dates in a folder which has saved me so many times) but i cant seem to find anything