Our user reported a PPTP bug in 1.1.0: options.pptpd is not generated correctly with default options. The symptoms are: PPTP does not work at all.
This is the result of a typo in the code for required authentication protocol options, it will be fixed in the next maintenance release.
Fortunately, the workaround is trivial: set the required authentication protocol manually. Most commonly:
set vpn pptp remote-access authentication require mschap-v2
Thanks Sergey and Antonio for help with finding the bug!