Unfortunately, with the latest AppBuilder release we introduced a couple of bugs in our simulator. Please, refer to this forum thread
, where you will find them described. Our team is currently working on finding the best possible solutions to the matters. We plan to release a hotfix as soon as possible.
In the meantime, you can use the device simulator in the in-browser client
or run your app on a physical device
or in the native emulators
Thank you for the understanding in advance.