With 1.7 (OS 10.6.2), import of markers (.cue) is not working anymore. Anyone else with this problem?

There was indeed a problem when importing cue files in the latest update. This is now fixed, and the correction will be available with the next update. Until then, you can use the current development version:

http://twistedwave.com/download/TwistedWave1.7.0.5.dmg