Dead Island PS3 1.04 patch problems

I've already made some changes to my review of Dead Island due to tweaks from the latest patch labelled 1.04 but makes the game 1.3.0 (go figure) most notably that kicking now uses stamina. However it has led to some additional problems; and some still exist. In the order I encountered them:

Problem number 1: The character now seems to strafe like a dump truck. For the first time ever in a PS3 game I had to change the sensitivity of the sticks to get it back the way it was.

Existing problem 1: I mentioned that the re-spawning enemies seemed to have been fixed... I was wrong. In the police station I had enemies spawning directly in front of me - just appearing out of thin air.

Problem number 2: On occasion the quest guideline disappears if I set a custom waypoint and then remove it. Switching to other quests highlights the flag in red; but no guideline. As a bonus though any side-quest has the goal flag showing up on the map - so I'm guessing the game is confused as to which flag it should be pointing to.

Existing problem 2: The guideline (when it works) for the Voice from Above Quest still leads to a impassable wall in the Jungle.

Problem number 3: Disappearing weapons.  When upgrading or crafting; the weapon that is being altered can disappear. I first noticed this when modifying the reward from finding the crashed plane. I came out of the menu and found myself holding an invisible weapon. Assuming a one-off glitch later I created some pistol and rifle ammo and found both of these weapons had been removed from my inventory. I had to bomb out of the game rather than exit gracefully as it saves the current state when doing so. As an aside this seems to correspond with the disappearing guideline problem.

Problem number 4: Stacking. Meat-bombs and med-kits now stack to 30... sometimes. I've checked my inventory and found stacks of 30; 6; 5 and 2 Molotovs. Equipping and de-equipping doesn't cause a re-stack only dropping and picking up. Loading again can also re-stack or cause the stacks to separate in the first place.

I've yet to return to co-operative play due to the disappearing weapon glitch - as the game saves from actions of the other player and I really don't want to lose the weapons I've got thank you very much.