I am really sorry for the problem. This is an expected behavior - Kendo UI Mobile, Web and DataViz use common core. including the three scripts overrides some class definitions, which results in the problem you describe.
Thanks for reporting the problem with the outdated download builder - we are working on fixing that immediately. I will get back to you when it is fixed. Once done, you will be able to build the script needed. Your telerik points have been updated for the inconvenience.
On a side note, our mobile demos use kendo.all.min.js 515, and the tabstrip functions correctly. You can refer that script from the CDN url -
the Telerik team
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