Issue when using version 4.0 Units view

I recently downloaded latest version of scheduler 4.0 and when usnig the Units view if I click on previous/next buttons I see follow error in javascript console.

TypeError: scheduler.date[(scheduler._mode + “_start”)] is not a function dhtmlxscheduler.js:2104

Anybody seen this issue?

Hello,
i’ve checked units view example from v4.0 standard package -
scheduler/samples/03_extensions/02_units_view.html
everything seems working fine, can you give some more details?