There is currenty a bug if you export and enable the "Join into one PDF" option. I have a fix in place for that that will be included with the next update. One workaround is disable the exporting of cropping, as this avoids the bug. There is another bug in the Windows 10 version that can cause crashing while exporting that I have also fixed. I still have a few issues to investigate and potentially fix, but then I'll release the update once things are ready.
Mike
Mike