I haven't had any problems. I have seen via apt-listbugs that kmod 20 has problems and so I have held at kmod 18.3 Numerous bugs been put together over kmod 20 and udev <219 - some involving tun and ppp 780255 780256 780299, etc. - which all hinge on 780263. These bugs started up about March 11th.
If I read it right, the problem is confined to sysvinit systems, but I might be quite wrong about that. It appears that today (March 20) they are coming together about how to fix this to smooth the transition of jessie to stable and also for the next transition when jessie departs.
Of course, your problem might not have anything to do with kmod.
Not trying to hijack or anything, but since I started using openvpn less than 2 months ago, I initiate it in tty2 as rootj ust prior to going to gui via init 5 in tty1. If I should not be doing that, I would appreciate a message. Peace