Yes, we need steps to reproduce the issue to be able to investigate it. Please provide these otherwise there is nothing we can do. Unfortunately videos generally do not help - we cannot debug a video.
There have been no significant changes to the save system since the last stable release r269 so it seems unlikely this was a recent change in Construct. There are several other reasons saves could fail, including driver bugs, hardware failure, software conflicts and so on - it may be one of those reasons instead.