You can’t select value with double quote using mouse. It is also not highlighted in suggest list while navigating using keyboard (up & down keys). Here’s the snippet:
http://webix.com/snippet/ca3a7eb6
It is a problem with the autogenerated item id - it uses the same text as the value and it breaks when there is a double quote in the id.
Specifying an id will fix the problem: http://webix.com/snippet/0c20686f
I guess that fixing processing records with double quotes in ID and/or generating IDs without double quotes will “fix” the the issue.
The problem originates on the level of Webix JSON data parser. In case of plain array it generates a record like { id:str, value:str}, which leads to drawing and other issues: http://webix.com/snippet/eccd97a6
We will consider changing or escaping automatic IDs of data items. For now I can recommend you to specify the IDs explicitely, as reycri suggested.