The debug version removes all optimization, so it will definitely be much slower. Sometimes, only the optimized version will crash, so if you want to solve it you'll need to add debug information to your release version and debug that crash.
Neither one should crash, so there's something up with your installation somewhere. Finding where the crash is will probably give you a clue to what might be wrong.
If you're seeing NPCs that should be invisible then you may have something wrong with your database or client, but things like MQ2 can do that as well.
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