1.7.9 Mac Procedure System block selection option crashes the program

I am new to the procedure system, I don't know if I am doing something incorrectly, but whenever I am choosing a block in that special button in the procedure system (I don't know what it's called but there is only one that lets you select blocks) the program stops working.  So if I click on the square, the program freezes and I have to force quite it on my Mac.  I have 8gb of ram and I let Mcreator use 4gb of it, so I think it might be a problem with the program.  I have looked for other people having this problem and I haven't seen any.

Thanks in advance.

(love this program👍👍👍👍👍👍👍👍👍)