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This bug was originally marked as duplicate of bug 209525, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 Beta 2 (Build 201211062253) VM: Java HotSpot(TM) 64-Bit Server VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_10-b18 OS: Windows 7 Stacktrace: java.lang.AssertionError at org.netbeans.modules.form.layoutdesign.LayoutAligner.hasAlignmentInParent(LayoutAligner.java:1097) at org.netbeans.modules.form.layoutdesign.LayoutAligner.alignedIntervals(LayoutAligner.java:1060) at org.netbeans.modules.form.layoutdesign.LayoutAligner.transferedComponents(LayoutAligner.java:834) at org.netbeans.modules.form.layoutdesign.LayoutAligner.transferToParallelParent(LayoutAligner.java:576) at org.netbeans.modules.form.layoutdesign.LayoutAligner.alignIntervals(LayoutAligner.java:96) at org.netbeans.modules.form.layoutdesign.LayoutDesigner.align(LayoutDesigner.java:3015)
Created attachment 130081 [details] stacktrace
Reported for 7.3.x or earlier, no new info since then -> closing as worksforme, please reopen in case you see it.