"Build Now" link does nothing

Question

I'm getting my feet wet with Jenkins and I've done something bad. Originally, I had a Bitbucket hook that triggered builds. When I had that in place, I could run builds on demand using the Build now link in the sidebar or in the view table. I decided to run job builds nightly instead and now I can't run them on demand. Clicking either Build now link just flashes a tooltip that says "Build scheduled".

I'm not sure what I did, but there are a couple of possibilities:

• I removed the Bitbucket hook and selected the Build periodically option with a value of H H(2-10) * * *.
• I enabled Bitbucket OAuth security and set privileges to Logged-in users can do anything.

I've tried reversing both of these, but that hasn't worked. I've also bounced the jenkins service (many, many times). I may have changed something else relevant, but I don't know what that might've been.

Has anyone else seen something like this?

Answer 1

I had the same symptoms, a different problem, and this tip in the comments was helpful:

...find something suspicious in Jenkins->Manage Jenkins->System Log->All Jenkins Logs

For me it turned out the jobs in the Jobs folder had the wrong owner.

Answer 2

For me, it was that the EC2 instance I was running Jenkins on had run out of memory.