Hey! Yeah I believe to be Realism, as it is in the test phase I guess that's a bug with it. I read somewhere about this bug but I can't remember if Realism was the cause, but yeah, It probably is as you say.
Have you found the culprit? I also can't play without Realism anymore, I'm still playing 3.8 because I took a break from SPT and when I went to update to the last version and saw Realism wasn't updated I kept playing 3.8 for a while, but now I was ready to check 3.11 out and I had to install the test version xD
Hope this helps you in some way, cheers!
We're on the right track, I did some more reading and watching of videos yesterday actually and found that it is realism.
So, until they've released it fully and put out comp. patches - it'll probably stay as an issue.
Thanks for replying!