My first post!
I recently added a lot of things- psa hacks such as complete rosalina, lloyd and mewtwo- sound hacks such as lloyd announcer call (with fix), mewtwo announcer/attacks sounds, and I added some more portraits to the CSS, along with custom battle icons and stock icons.
I added these all at one time and then went to test them out.
It makes it to the character selection screen, so I think the file size of common5_en.pac is okay, but when I click on the character, right before it says the announcer call for ANY character, the game freezes.
I use BionicSonic's modlauncher for Riivolution. I am going to continue modifying and testing right now, and hopefully I will eventually find the problem. I'm posting here in case that doesn't happen. I've been brawl hacking for years, and this case has never happened to me.