RD-X8使いですが、tainavi_v3.22.18b+1.6.4b.zipを使用しても予約時に落ちてしまう
状況は変わらずです。
予約は出来ていますが、その後の表示処理で落ちている感じですかね。

java.lang.NullPointerException
at tainavi.AbsReserveListView.setOverlapMark(AbsReserveListView.java:843)
at tainavi.AbsReserveListView._redrawReservedList(AbsReserveListView.java:596)
at tainavi.AbsReserveListView.redrawReservedList(AbsReserveListView.java:460)
at tainavi.Viewer$1.actionPerformed(Viewer.java:2126)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
〜〜以下省略〜〜