Wired4Signs USA review for GTManager

Update: We have resolved internal issues which resulted in the app not loading as expected. Most importantly though, the author has been in touch immediately to resolve this issue. Support is important! Original review: We are using this app to publish our GTIN data to Google Merchant Center and it worked without any issues. Today we were notified by Google that 90% of our products on GMC do not have a GTIN. So we try to check what is happening in GTM, but ... "cannot connect to server" ... is this app dead?