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+======================================================================
+
+Qt paint engine makes common use of shared memory. To avoid MIT-SHM
+errors (i.e., blank windows), you probably need to tune shared memory
+limits in loader.conf(5). The following should be safe values for the
+KDE Plasma Desktop:
+
+kern.ipc.shmmni=1024
+kern.ipc.shmseg=1024
+
+======================================================================