In Chrome 63: the ghost element is not being displayed correctly in some situations. Normally when you drag an element, you should see a transparant 'copy' of that element, instead a file icon sometimes appears in some cases. You can test this on the demo page http://rubaxa.github.io/Sortable/.
Not sure if the change in Chrome making this happen is a Chrome bug or not.

@bart-1990 I experienced the same issue with chrome 63 (related to their latest implementation of HTML5 Drag&Drop). Updating to the latest sortablejs fixes this bug.
{ "sortablejs": "^1.7.0" }
I still have the bug in 1.7.0
Please note : this happen only when the page is being scrolled down.
I'm still encountering this bug in the latest version (1.7.0).
I've encountered this bug too - doesn't seem to occur in Safari.
onEnd not work on Chrome 61/62/63
Seems to be ok again in Chrome 64 (beta), so it probably is a Chrome bug.
Just to confirm : this has been fixed in Chrome 64
I tried on the site with last version of Chrome and drag and drop seems still kinda buggy
I tried on demo site (http://rubaxa.github.io/Sortable/) with Version 64.0.3282.119 (Official Build) (64-bit) ubuntu ,but drag and drop seems still not work.
window 7 64bit
chrome 64
sortable.js 1.7.0
Sortable doesn't work
I must say sorry about last time I commented on this issue . Sortable doesn't work just because my chrome had a extension that was used to drag and select some text to translate to Chinese. the extension has a bug that can't drag and drop something .
So maybe everyone test sortable.js should in a incognito window .
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onEnd not work on Chrome 61/62/63