Internal server error when trying to set custom blocks in add block section per user group

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I keep getting an internal server error whenever I try to save after adding a user group to "add block" permissions. I can create the user group just fine. I don't know how to fix this at all. I presume I may have to chmod some files but not sure what. Any help anyone can give would be much appreciated. Here is what I see in the console:
index.php/tools/required/permissions/categorie…n=1439537658:db030fd9fb930bb29c6cabec59f29ec3&task=save_permission&pkID=19 Failed to load resource: the server responded with a status of 500 (Internal Server Error)
. Thanks much in advance. Oh and advanced permissions are turned on. Currently running 5.7.5RC1

 
WillemAnchor replied on at Permalink Reply
WillemAnchor
I believe this was fixed in 5.7.5
I'm not behind my desktop atm. Can you upgrade and report if the problem is still there?