Yeah, I have no clue what the problem is with this. I have gone through and combed List.XML, and Data.XML, I removed every trace of "design_71_71", including all .DESIGN files, all resources numbered 71, everything.
I opened SW. Went into my resources on forge and removed the Animation Manager behavior that I uploaded from JnR Lite, I uploaded the behavior again and then downloaded it, again, into my game. Saved the game, closed the game, opened the game, Custom Blocks were all gone.
I am curious, could there be any possibility that conflicts would arise as result of Custom Block ID's somehow being altered. I can't remember how it had happened, but when I was first adding in the behavior, I noticed a few custom blocks had been altered or rather, overwritten.
I was thinking that some how, for whatever reason, these ID's are getting overwritten, and the reason they may not show up is because SW thinks that they they do exist, just as different blocks than what we want them to be.
Anyway, I think for me to best solve this problem, I will have to just rewrite the behavior myself and possibly give it a different name.
Custom blocks disappearing with behaviors on forge are the biggest problem I have been having and is really annoying. I hope someone has an opportunity to look into it before we launch.