I just had a windows update yesterday and so I thought that I would try once again and open the AMS wallet and guess what it is now loading again and I was able to log in and start staking again. I don't know if it is windows that's the problem but I was trying for weeks and nothing but now the wallet loads again.
Did you reinstall the wallet after the update and restart of system or was there installation already?
I found my working installation didn't start after an update and a restart.
Tried delete everything and restart then reinstallaton, but it didn't work.
I found there is AmsterdamCoin folder but the AmsterdamCoinNode folder was not installed in Roaming folder.