I still run a RC build of HA-Bridge at my off grid place and had no real issues there. However I did update from a RC build here in the city and have had some issues here. As I stated before Amazon doesn't roll out updates to everyone at the same time. This causes you to see a problem that I don't. I did have the issue with being unable to add a device at my city place prior to updating HA-Bridge as well as after. Ive solved this a couple of ways easyest is to remove the device from HA-Bridge and readd it which gives the device a new id which Alexa seems to find.
The other way is a bit more involved and if you have other devices besides HG ones means a total reconfigure of alexa and the Bridge. If only HG devices remove all then add all HG devices fromHA-bridge. If you add them the same order HA-Bridge gives them the same Ids so a forget from Alexa isn't required and it sees the new device.
The device isn't responding message from Alexa but still comes on is a timing issue. It is possible to set time delays in th HA-Bridge and seems to be location specific what works for me may not work for you.
The latest issue I'm now seeing is one device fails and I get an error message in the Bridge however I can't seem to track this down as it isn't constant. Once I turn on debugging and fire off the on command the device works both on and off. Sometimes it just starts to work if I turn on a different device then the failed device.
As petera stated all software emulaters are suffering from Amazon's Alexa updates. Some are more severe then others and harder to keep up with.
When I first switched over to using HomeGenie I used both Google and Alexa for X10 control Google required some extra work. A modification of an existing program I had created using SmartThings developer portal made that possible. I started a thread for this on HomeGenie.club but there was no interest. Another user created a Google HG program which works well so I dropped the smartthings route. From what I remember I was able to eliminate the need of my SmartCloud program and use HG directly with SmartThings.
I may have to look and see if I still have any notes on this.