Error after upgrade to dhtmlx.js v5.1

I’m having an issue with posting scheduler updates through dhtmlxConnector following an upgrade to dhtmlxSuite (v4.4 to v5.1) and dhtmlxScheduler (v4.1.0 to v4.4.9).

The schedule loads just fine, and updates appear to be handled successfully on the server side, but the client is throwing an error upon receiving the response:

Unhandled exception at line 9, column 31232 in [localhost:52744/codebase/dhtmlx.js](http://localhost:52744/codebase/dhtmlx.js)
0x800a01b6 - JavaScript runtime error: Object doesn't support this property or method occurred

The object “h” at the throw breakpoint contains the following values:

h.filePath = “SchedDataHandler.ashx?editing=true”
h.state = “rejected”
h.xmlDoc = <?xml version="1.0" encoding="utf-8"?>
h.val.stack = “TypeError: Object doesn’t support this property or method
at dataProcessor.prototype._log (localhost:52744/codebase/dhtmlx.js:9:1556391)
at dataProcessor.prototype.afterUpdateCallback (localhost:52744/codebase/dhtmlx.js:9:1555456)
at dataProcessor.prototype.afterUpdate (localhost:52744/codebase/dhtmlx.js:9:1557017)
at r (localhost:52744/codebase/dhtmlx.js:9:1552842)
at Anonymous function (localhost:52744/codebase/dhtmlx.js:9:15241)”

Any help would be greatly appreciated…

Jeff