I have the same problem. I'm using MaximDL. I reported it yesterday under the topic name
"A problem with ASCOM driver v6.5.14"
I received a reply to reinstall ASCOM 6.5 SP1. But the problem persist. I'm not sure if the tech support person understands that the problem is with their driver version v6.5.1.4. Because when I reinstall v6.5.1.3 instead, everything works normal again.
I'll keep an eye on your topic here as well, maybe you'll get a different answer from them.
Good luck.