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Bug
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Resolution: Cannot Reproduce
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Major
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Jenkins 1.604
Updated plugins (based on JPI modification date - some do not show a previously installed version):
Ant Plugin 1.2
Environment Injector Plugin 1.91.1
External Monitor Job Type Plugin 1.4
HipChat Plugin 0.1.9
JUnit Plugin 1.5
Matrix Project Plugin 1.4.1
Multiple SCMs plugin 0.4
Script Security 1.13
SSH Credentials Plugin 1.10
SSH Slaves plugin 1.9
Static Analysis Collector 1.43
Static Analysis Utilities 1.71
Windows Slaves Plugin 1.0Jenkins 1.604 Updated plugins (based on JPI modification date - some do not show a previously installed version): Ant Plugin 1.2 Environment Injector Plugin 1.91.1 External Monitor Job Type Plugin 1.4 HipChat Plugin 0.1.9 JUnit Plugin 1.5 Matrix Project Plugin 1.4.1 Multiple SCMs plugin 0.4 Script Security 1.13 SSH Credentials Plugin 1.10 SSH Slaves plugin 1.9 Static Analysis Collector 1.43 Static Analysis Utilities 1.71 Windows Slaves Plugin 1.0
Our jobs are almost exclusively triggered by SCM changes. This way we avoid unnecessary builds of older releases or otherwise inactive branches. After upgrading from 1.602 to 1.604 on Monday, SCM triggered builds have stopped triggering.
This is not critical for nightly builds, as they are easy enough to set to periodical builds instead of SCM polling. However, for our continuous builds which poll regularly (more regularly than the actual build time), it's not really an option to set the builds to build periodically. Yes, the regularity could be lowered. But this could lead to a lot of failed build spam, if there are PMD issues or similar late one day.
After downgrading to 1.602, without downgrading plugins, builds started triggering again normally. I will retry with 1.605 in a few minutes, and see if this has been resolved in the latest release.
[JENKINS-27478] SCM polling (Mercurial) stopped triggering builds after upgrade to 1.604
Sigmund Hansen
added a comment - 1.605 didn't seem to help. The downgrade to 1.602 doesn't seem to work consistently. Although some builds were triggered, others were not. I will try downgrading different plugins to see if one of them may be affecting the polling.
Sigmund Hansen
added a comment - 1.605 didn't seem to help. The downgrade to 1.602 doesn't seem to work consistently. Although some builds were triggered, others were not. I will try downgrading different plugins to see if one of them may be affecting the polling. Sigmund Hansen
added a comment - I tried upgrading the Mercurial plugin, we had had some issues with 1.51 before, so we had held back updating to it from 1.50. Some of the jobs are now triggering consistently after the upgrade to 1.52. After manually triggering the other jobs, they seem to be executing as they should.
Could be there was some kind of incompatibility between the 1.50 plugin and one of the other plugins (I'm guessing that it was not compatible with one of the plugins, since the downgrade to 1.602 didn't help).
Sigmund Hansen
added a comment - I tried upgrading the Mercurial plugin, we had had some issues with 1.51 before, so we had held back updating to it from 1.50. Some of the jobs are now triggering consistently after the upgrade to 1.52. After manually triggering the other jobs, they seem to be executing as they should.
Could be there was some kind of incompatibility between the 1.50 plugin and one of the other plugins (I'm guessing that it was not compatible with one of the plugins, since the downgrade to 1.602 didn't help). 
1.603 would be interesting as well.
FWIW I just don't see any changes in Jenkins that could be related if you're polling rather than using SCM hooks to notify Jenkins.
https://github.com/jenkinsci/jenkins/compare/jenkins-1.602...jenkins-1.604