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In the Performance Management view > Failures and Downtime tab > By Asset page, for a configuration that is grouped by Failure Classification when highlighting the column in the table view and right-click selecting ungroup, the application service crashes.
This has been reported as Issue #082927 - Ungrouping a column on an MCLB in Performance Management Failures and Downtime By Asset page results in crash.
The workaround is to open the configuration directly from the configuration button and make the change to the configuration column manually, avoiding the right-click.