Ive updated to the latest ornatrix version for Maya 2018 but it doesnt matter which version I use of ornatrix or Maya I seem to get these two errors.
First one is that I sometimes cant move the root or tip of a guide curve.  I read symmetry could be a problem but I have it off the whole time.  This happens randomly some times it work fine. 

Second when I use the comb brush I some times get this error Cannot find procedure OxSelectBrushContextValues Ornatrix and Im unable to use the comb brush anymore.  Restarting maya fixes it but it happens so often its starting to become a problem.

I think someone should a create groom from scratch each time you submit a stable version of Ornatrix perhaps fixing one thing causes problems with another tool.  Maybe working in longer sessions can causes problems aswell.