I have been using ODK-X for past 4years now. All of a sudden, my development machines are giving me an error “You must use a Chrome or Safari browser (note: this is tested only on Chrome)”. This is happening when I run grunt -adb. I have tested on both of my two laptops and I am getting the same error.
Likely, a newer version of chrome has a different method of obtaining the browser information. Or due to a new security update app-designer is having trouble determining the web browser.
Will require further research. However, you asked about have a clue.
I also got the same error, while trying to run the “grunt” command to load the ODK-X Application Designer.
Till the issue get resolved to access the app-designer on latest google chrome version, alternately installing Safari browser 5.1.7, the last stable version released by Apple for Windows, will help.