Resizing columns are somehow possible by dragging the borders between the data cells, in addition to headers.
This becomes problemmatic when the “drag” option is enabled :
http://snippet.webix.io/d687e097
I think resizing columns should be limited to header cells area.
Yep, good catch
We will update code in the next build, when drag-n-drop enabled, resizing in data area will be blocked.
maksim, thank you!
I’m testing/studying the webix a for a couple weeks and found it absolutely better (and much faster!) then any other.
Thank you for creating such an excellent library.
I will keep posting suggestions and bug reports to help improving it, is this place the best for posting bug reports o shall I use github?
is this place the best for posting bug reports o shall I use github?
You can use forum or tracker, as you wish.
Tracker may be a bit better, because a status of an issue is more clear. Also, we will not forget to fix such issue for sure 
New build will be available on Monday, will fix the above issue as well