I've tried setting it in cab and also with a USB keyboard (CTRL+ENTER and SHIFT+ENTER) on a variety of locos such as the 377, 350, 314, 323, 700 (I know about the fuse on the 700). and it just doesn't engage. Here's an example on the 377 on WCML South: Enter the cab. Press SHIFT+ENTER and CTRL+ENTER on my USB keyboard. Set the master key (CTRL+W). Set the reverser to forward. Now at this point the AWS should sound, but it doesn't. Also the flower doesn't engage either. If I carry on setting up the train and get moving there is no AWS activation when approaching any signal. I have disabled all random behaviours and faults in the settings. Now here's where things get weird. AWS works fine on my Just Trains addons! I also installed TSW5 with WCML South Euston - Milton Keynes and AWS works properly there. Does anyone else have this problem? EDIT - I have reinstalled, but it didn't help.
PROBLEM SOLVED!!: So I compared my settings between TSW 5 & 6 and noticed that in TSW5 in the controller settings, I had controller sound volume at 0 (I play through headphones connected to a TV). In TSW6 the same option was at 50% volume. So I set it to 0 in TSW6 and AWS now works! How strange is that?