Z3TA+ 2.1 Preset name not shown in "Presets" drop-down; instead it shows "- - -"

Hi,

I've been using Sonar X1c 64bit on Windows 7 for two months, and also bought Z3TA+ 2.1 about two weeks ago (along with the Rapture upgrade from Rapture LE).

I have already created a couple of presets for Z3TA+ 2.1, and saved them by writing the new name in the "Presets" drop-down and hitting the "Save" button.
Initially I had no problems with this, but now the Presets drop-down always shows the string "- - -". My presets are still in the list, and the sound changes when I select them.
But their name is never shown in the drop-down. The buttons for incrementing/decrementing presets don't change the preset name neither.
I cannot delete the "- - -" entry from the drop-down.

Any hint on how to solve this would be greatly appreciated.

Best,
Georg