If you've been using the same version of Explorer++ for a while, I'd say that it's probably an external problem. I'm only connected to a homegroup myself, but I was able to create folders ok.
It's always possible there could be a bug within the new folder code. But, without the ability to get more information, it would be difficult to diagnose. I did add some logging code relatively recently, but it's not been used in that area.
If you're keen to solve the problem, try downloading API monitor
, and logging the API calls that Explorer++ makes. Keep an eye out for the CreateDirectory
call. Once you've done that, just paste the relevant contents here. At the very least, the output will show the exact error been returned and the path that's been used.