Issue
After upgrading Jenkins AnsiColor plugin to version 0.6.0 or 0.6.1 or 0.6.2 colors are not immediately displayed in the Console log.
The issue is caused by https://github.com/jenkinsci/ansicolor-plugin/issues/136.
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
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CloudBees Jenkins Enterprise
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CloudBees Jenkins Enterprise - Managed controller
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CloudBees Jenkins Enterprise - Operations center
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AnsiColor Plugin
0.6.{0,1,2}
Workaround
The current workaround is to downgrade AnsiColor plugin to version 0.5.3.
According to https://github.com/jenkinsci/ansicolor-plugin/issues/136 you also can work around the problem in 0.6.x of the plugin by refreshing (F5) the page.