Unfortunately all WorldEdit 6 builds contain a major bug that causes issues with JEIDs and NEIDs as well as a handful of other mods, and a fix was shipped in a WorldEdit 7.0.0. Deleting WorldEdit 6 on first load and replacing it works as a temporary solution, but realistically for long term viability it'll probably be worth using WorldEdit 7 as a dependency instead of 6.1.8.

Be more specific. In what scenario WorldEdit 6.1.8 fails with which mods and how can we replicate this if needed to investigate? Include a list of all the mods used and a log that shows any errors if any. Use Pastebin or Gist.

It is a goal to use WorldEdit 7 by default once it is determined to be stable enough. WE 6.1.8 is really old and we are only using cause we have had stability issues when testing with WE 7.

DimensionalDevelopment/JustEnoughIDs#37

Here's one of the issue threads.