Project list is not updating in desired interval. Problem is in GerritServer.java in start() method, where projectListUpdater is created but isProjectCreatedEventsSupported() returns "true". It is because gerritConnection is not yet established, getGerritVersion() returns null and feature.versionNumber.isNewerThan returns false for NaN parameter.
Initializing of projectListUpdater should be delayed after gerritConnection is initialized.

Same problem with missedEventsPlaybackManager.isSupported() in GerritServer.java - start() when Gerrit server is up later than Jenkins.

Also server connection Stop/Start should trigger project list update.

I have Jenkins on different machine than Gerrit so connection could take a second.

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See attached log file
Nov 10, 2015 11:41:58 AM com.sonyericsson.hudson.plugins.gerrit.trigger.version.GerritVersionChecker getGerritVersion
SEVERE: Could not find the Gerrit version for vyvoj.zat.lan
Nov 10, 2015 11:41:58 AM com.sonyericsson.hudson.plugins.gerrit.trigger.version.GerritVersionChecker createVersionNumber
SEVERE: Gerrit version number is null or the empty string.
Nov 10, 2015 11:41:58 AM com.sonyericsson.hudson.plugins.gerrit.trigger.GerritServer start
INFO: vyvoj.zat.lan started
Nov 10, 2015 11:41:58 AM com.sonyericsson.hudson.plugins.gerrit.trigger.GerritProjectListUpdater tryLoadProjectList
INFO: Not connected to vyvoj.zat.lan, waiting for 1 second(s)