Microsoft IIS - Views UI errors on changes - does not refresh

I have inherited a site installed using Microsoft IIS, When changes are made in the Views UI, I get a screen-full of code (ajax?) in place of an updated Views dashboard. I've attached a text file of the code displayed. If I use my back button I can get back to the UI, and changes actually are being saved, but don't appear until I save and reload the edit screen.

I suspected updates were applied improperly so I have reinstalled with the latest version. Any ideas?

excerpt of an example (the code changes appropriately to what is being edited)

{ "display": "\x3cform action=\"/admin/build/views/ajax/add-item/approved_screenplays/page_1/field\"  accept-charset=\"UTF-8\" method=\"post\" id=\"views-ui-config-item-form\"\x3e\n\x3cdiv\x3e\x3cdiv class=\"views-override clear-block\"\x3e\x3cinput type=\"submit\" name=\"op\" id=\"edit-options-override-button\" value=\"Override\"  class=\"form-submit\" /\x3e\n\x3cdiv class=\"description\"\x3e\x3ca href=\"/help/views/overrides?popup=1\" class=\"advanced-help-link\" onclick=\"var w=window.open(this.href, \x26#039;advanced_help_window\x26#039;, \x26#039;width=500,height=500,scrollbars,resizable\x26#039;); w.focus(); return false;\" title=\"What are overrides?\"\x3e\x3cspan\x3eHelp\x3c/span\x3e\x3c/a\x3eStatus: using default values.\x3c/div\x3e\x3c/div\x3e\x3cdiv class=\"form-item\" id=\"edit-options-exclude-wrapper\"\x3e\n \x3clabel class=\"option\" for=\"edit-options-exclude\"\x3e\x3cinput type=\"checkbox\" name=\"options[exclude]\" id=\"edit-options-exclude\" value=\"1\"   class=\"form-checkbox\" /\x3e Exclude from display\x3c/label\x3e\n \x3cdiv

Thanks, Bob Snodgrass