My browser / operating system: Windows NT 10.0, Chrome 85.0.4183.83, No Flash version detected

So I was making a Platformer, and obviously to make one of those I need (or at least would prefer) to use Run without Screen Refresh blocks. But for some reason it won't let me make any.

I create the block and tick off “Run without Screen Refresh” box but then when I go to use it the blocks refreshes the screen anyway. I can tell it's refreshing the screen because everytime the script is run it glows yellow and blocks that Run without Screen Refresh aren't supposed to do that (Also it's extremely laggy).

(BTW I have 3 other Custom blocks that are working just fine, but when I try to add a new one it doesn't work.)

Can you share the project? Also make sure the custom block does not call blocks that refresh screen, such as “wait x seconds”, “broadcast and wait” or other screen refreshing custom blocks.

Well the Custom Block only uses:

These Blocks: :: grey hat
Motion :: motion
Control :: control
Sensing :: sensing 
Operators :: operators
Variables :: variables
and of course :: grey
Custom Blocks :: #612892

Would any of those cause issues?

Wait I just found the issue… Nevermind

Apparently I had missed a number in one of my operators that made a repeat loop go on indefinitely…

Well actually for some reason it's still glowing yellow even if it's running without screen refresh, but at least it's not causing huge amounts of lag.

Edit: That's odd, the block I mentioned before stopped glowing yellow. But now a different block is glowing yellow when it's not supposed too…