Several people on the forum (including myself) have run into this issue a few times here and here, just to list a couple.
In my case this issue seems to resolve itself…it is unknown if something I did fixed it. To reiterate what @Frew said and add slightly to it, the steps I have taken are:
- PowerCycle and/or Factory reset the printer
- Clean install of Preform (uninstall then delete leftover files)
- Restart router
- if you are using an old .form file, reimport STL and recreate supports.
If all else fails contact support like @Frew suggests. I hope this helps.
- Kevin