I was asked a question about the ruling. Although it was not clear for me whether the question was related to the YATSL game or not, the answer may be relevant in YATSL games. The question was:
If a player plays Grain Sales to Soviets in Headline Phase, pulls UN Intervention, and plays it instead of returning it, is taking back such a move allowed under mutual agreement?
I analysed the wording and the spirit of the rules. They say that a known avoidable bug must not be exploited and that taking back moves is not allowed even under mutual agreement unless it is done to repair the damage caused by the engine bug.
Offering an experienced player an opportunity to play a card in a way he is not allowed to do may cause him use the opportunity involuntarily. This is not a typical exploit and this is not a typical misclick. This is an action which is forbidden by the rules but allowed by the engine. So, this certainly break the rules and, therefore, may lead to immediate game ending due to it, but such an ending can be easily treated as a damage caused by the engine bug which is the only exception to the no-taking-back rule, and I am into such an interpretation.
Therefore, the official answer is:
Yes, this is allowed if both players agree to it. If any player disagrees taking back is not allowed and USSR player has the right to claim immediate victory.
I will add this to the rules for the next season but this interpretation is binding for future games. Please note that this does not change anything for players who disagree with my interpretation as they may easily disagree for a takeback, therefore I consider it fair to change the rules this way in the middle of the season.
The newest versions of Firefox and Chrome no longer support Java and they are declared to never support Java in the future due to security reasons. Oracle officially recommends using Internet Explorer on Windows and Safari on MacOS but this still leaves Unix users (like me) in trouble.
For Firefox the official Oracle’s recommendation is using Firefox 52 ESR release but I do not recommend this. Despite being a quite experienced user I could not really make it running well, and this will cease to support Java in 2018 anyway.
What I recommend for Unix is SeaMonkey 2.46 release. It is yet another free browser delivered by Mozilla Foundation, and, although it looks like a 20th century product and just a less ugly version of Netscape, it’s fully functional as for entering Wargameroom.com chat. What is more, you do not install it as a system application, instead you just unpack the downloaded file into your home directory and run the binary directly from there. Therefore, you do not need a superuser privileges to get this browser, all you need is a disk space: 150 MB at once (almost 50 MB for packed version plus 100 MB for unpacked version) plus whatever data you need to store minus 50 MB (because you may simply delete the packed file after unpacking the browser).
I hope this helps somebody.