This was working fine yesterday. I have an older bayonet mount lens on Nikon D90 and am using a pop-up flash in commander mode. I turned on the camera today and no shutter when pop-up is ON. I turned off the pop-up flash and shutter works. I changed to newer lens and there are no problems. This is a new issue.
All shooting is done in manual mode. I cleaned the contacts, charged the battery, and have put an old lens on and off the camera. What is the problem? Did my settings get changed somehow?