Thank you. Yes, it would pull the output to low. I will tie this to the supplied voltage to be proper but I don't think this is the problem.
I will try the decoupling capacitor from + to ground and see if that fixes the problem. Thanks so far!
I am having trouble with a mono-stable 555 timer circuit.
When I connect this to a power supply (right now it is a 120VAC to 12VDC converter), the timer turns on and then off, like it would have if it was activated by the trigger. After this, when the trigger is used, everything works...