All answers are "Yes"
I'm not but I tried many different settings and all avaliable output formats, results are same (but if I disable 64-bit engine I get an invalid vaw file).
I found only "Remove DC offset during record", nothing for externally imported audio. It's switched on.
I know you're right but I'm not a profi and not need extra quality for the time being, standard quality and features + ASIO drivers are enough for me. But I tried some other DAW's before and had no problems with rendering.
May be these problems caused by CbB's "analog sound oriented" engine?
P.S. I recreate the project with same samples and FXs, it was rendered very well. But when I add one more sample, I got invalid output vawe.
When I rendered another project with VSTi's and no samples, I got fine quality every time. So I assume now that some of my manipulations with the samples cause these errors.