Blueprint "Print String" not outputting to screen

I’ll run some better tests there tonight, but I’m not sure about when that error happens in there since it had never happened to me there, only to my students…
I’m also unable to reproduce it whenever I please, it’s pretty rare… I actually see that bug comming in because I’m currently mostly developing some assets for my team t use via BP instead of the usual Visual , So I begun working with print strings a lot… and on average I run UE4 on my PC about 8 hours a day, 6 - 7 days a week… and for the past few months I’m mainly working on Development through BP… so print string comes in hand 90% of that time… and yet, there were only about 10 - 20 times that happened… maybe 2 or 3 times on 4.6, the rest on 4.7

I’ll reply again after some tests at the school.