Mx5 Error: Failed to execute querySelectorAll on Element: *,:x is not a valid selector

After converting the latest 4 version to 5.6.0, I am receiving an error when loading the home page in a browser(mobile and web). There is no error in the Modeler console, neither is there an error in the JavaScript console in the browser. I have tried using default themes that work in other Mx5 projects. I have tried completely emptying the home microflow that is triggered as well as the form that is shown. The popup shows : An error occured, please contact your system administrator. Any ideas? Thanks in advance EDIT 1 After debugging in Chrome, pausing on exceptions finds this error stack : "Error: Failed to execute 'querySelectorAll' on 'Element': '*,:x' is not a valid selector. at Error (native) at chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:3:13168 at lt (chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:3:9722) at ot.setDocument (chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:3:12908) at chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:3:24416 at chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:3:24596 at chrome-extension://bjgfdlplhmndoonmofmflcbiohgbkifn/js/lib/jquery-2.0.2.min.js:5:19016" EDIT 2 Okay so not sure why it is doing the above in Chrome but when debugging in Firefox I get : An invalid or illegal string was specified http://localhost:8080/mxclientsystem/mxui/mxui.js line 16 > Function line 1 > eval
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