InfoPath Dev

Check out example in this article: http://alecpojidaev.wordpress.com/2012/02/10/combining-two-datasources-in-xpath/

Here is how: http://alecpojidaev.wordpress.com/2008/12/16/infopath-codeless-programming-walkthrough/

Try this: http://alecpojidaev.wordpress.com/2011/08/03/multiple-value-control/

Try this link: http://www.google.com/search?hl=en&source=hp&biw=1440&bih=741&q=infopath+calculate+business+days&oq=infopath+calculate+bus&aq=6&aqi=g1&aql=&gs_sm=e&gs_upl=1920l16660l0l18376l28l28l3l12l13l0l218l2116l2.7.4l13l0

No code required solution: http://alecpojidaev.wordpress.com/2009/07/06/how-to-check-if-your-form-is-dirty/

Just concat them together. If the field does not exist its value will be an empty string: eval(eval((EmployeeNextels1[EmployeeRadio = "Yes"]|EmployeeNextels2[EmployeeRadio = "Yes"]), 'concat(my:EmployeeNextel,my:TotallyDifferentField, ", ")'), "..")

Yes. Assuming both repeating tables have field EmployeeNextel: eval(eval((EmployeeNextels1[EmployeeRadio = "Yes"]|EmployeeNextels2[EmployeeRadio = "Yes"]), 'concat(my:EmployeeNextel, ", ")'), "..")

Here is the example where you don't need to compromise on using radio button: http://alecpojidaev.wordpress.com/2009/08/26/a-mutually-exclusive-check-box-in-a-repeating-section/

I don't think your problem is related to this article. Sounds more like problems with your network and/or SharePoint configuration.

Sorry, this solution DOES work in browser. Even this unchanged form will work perfectly in SP2007 web browser. There is small bug in rendering web forms in SP2010 which I was able to bypass in my new form (see the article)