Slide does not respond as per set triggers

Hi Walt, 

Thank you for your elaborate response; I truly appreciate it!

1. That makes sense, didn't realize this. Unchecking the 'pause timeline of base layer' does result in audio from layer overlapping with audio from base layer if the learner clicks the buttons too early. I solved this with a True/False variable on the timeline, and added a condition to the 'show layer' and ' 'change state' (had to re-add this trigger with a custom button state, see point 4) of the buttons and 'change state' triggers of the textboxes. 

2. & 3. Oops, very obvious actually - thank you for pointing this out! This was at least easily fixed :-).

4. I did not realize that adjusting built in states can result in misfunctioning of the triggers. Your suggestion worked great; removed the triggers, replaced the 'selected' state for the 'visited' state. However, this messed with my new restriction (see point 1) where I don't want the learner to be able to click the buttons until the timeline reaches 16 seconds. 
I solved this by creating custom states for the buttons called 'clicked' and added a condition to the other triggers on the buttons.

Attached is the slide should you be interested, exactly working now like I planned it to. I did not expect to have to add so many triggers and conditions, but I'm happy with the outcome. Thanks to your input!