My friend had a weird bug happen to him when he was working with UE4.12, but at the time I didnt think much of it.
Then I upgraded to 4.13 and it was working fine, for a while. However, when I tried to edit a blueprint by adding functions, macros, variables or in general adding elements I got this problem:
I have no idea how to fix it and it stays with me even after relaunches and restarts a few times, then vanishes.
After reloading the “unrecognized tab” becomes a proper menu tab. This always happen after a single restart.
I have been unable to reproduce or pin down why it starts or stops.
I haven’t been able to reproduce this either and I also haven’t seen any other reports of it. I’ll keep an eye for any in the meantime, but until we are able to get a solid repro case, there isn’t much we can do.
If you happen to find any leads while you are working, please make sure to update this post.
I know. I was only posting it as a notice so that if you get another report you know it is not a one of special case. Will update if I notice anything or can reproduce it.