I just tested the 6.7 Beta Version.
When i load a Waveform taken with the 6.6.xx, it is displayed,
but i can´t turn on the Filter in the Channels Menus.
If i load the Waveforms with the 6.6.18 oder 6.6.23
i can activate the filter when viewing the Files...
Would be nice if that could be fixed.