I have the same issue as this post: forum.dhtmlx.com/viewtopic.php?f=15&t=50669
I implemented the fix in the snippet (contained in the post): docs.dhtmlx.com/gantt/snippet/63d8a9f2
I have 2 issues with this fix:
If you scroll to the right to view the tasks off the screen, the tool tip will be nowhere near the cursor (you can try this in the snippet above).
The tooltip now appears over the grid area whereas it was over the task area by default.
Any help would be greatly appreciated. Thank you.