I distributed the first build version of my app to internal testers with iTunes connect and successfully installed on internal tester's devices. Now, I've uploaded the second build via iTunes connect. My internal tester's have received the email that build 2 is available and clicked on the button to view in test flight, but when test flight opens only build 1 shows available to install.
Is there something else that I need to do to make build 2 available to testers, or does it just take some time for it to show up in test flight even after the testers get the email that its available?
I've found that sometimes I've needed to toggle the 'TestFlight Beta Testing' switch to get everything to work.
UPDATE: iTunesConnect has been updated since the above answer. Now to reset it you should do the following steps:
Hit the 'Select Version to Test' on the right hand side. Select the version you want to test and then hit 'OK'.
Now you should be good to go!