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This bug is extracted from https://netbeans.org/bugzilla/show_bug.cgi?id=258606 Try to install Dark Theme and start debug session => you will see bad colors, like https://netbeans.org/bugzilla/attachment.cgi?id=159074 Evaluation shown that the problem is the following: - Dark Theme by default switches Fonts & Colors scheme to Norway Today, but bg colors assigned in Annotations tab are not auto-applied So, this bad colors Workaround is switch to another Scheme, Apply, Switch to Norway Today and Apply again
Btw, there is also mentioned NPE https://netbeans.org/bugzilla/show_bug.cgi?id=258606#c7 But may be it was fixed after 8.1. Beta (which was used to produce NPE)