We've already release ReCap Pro(version 1.1). I can reproduce the export issue in 1.0 but can't reproduce it in latest code. The fix for it should have been in ReCap Pro.
ReCap Pro can open RCP files created by ReCap 1.0. So you can export project in ReCap Pro. As installing ReCap Pro will uninstall ReCap 1.0, you can find another machine and have a try.
OK, now I'm confused. I thought ReCap Pro was just a rebadged brand of ReCap Studio which comes with design products.
Actually, ReCap Pro is the 1.1 version of ReCap Studio. It adds an important feature "Registration" for trial and other functions such as import/export are still free to use.
That did it. Big thanks!
Had I known that ReCap Pro was the successor to ReCap Studio, I would have upgraded long ago.
I think the description on the web page needs improvement to make this clearer.