Prop_dynamic issues
OK, I've looked for this for a while, but I couldn't find anything. When ever I place a prop_dynamic in hammer it shows up and everything works fine. When I compile and start the game, it disappears. If anyone knows what's causing this, please respond.
Which model are you using? Physics models cannot be used as prop_dynamics. They work fine in Hammer, then vanish. Use prop_dynamic_override instead. 
Same with dynamic props being used with physics. Use prop_physics_override.
always check the info tab if your model can be a prop_dynamic.
If you can't you should consider if it really needs to be a prop_dynamic. If it REALLY MUST be a prop_dynamic you can always use prop_dynamic_override.
Some models, for example the chairs you put into the observation rooms, must be prop_physics; if you made them prop_dynamic the compile warns you that they should be prop_physics and remove them automatically. Have you received any warning message when compiling?
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]No, I was using panels and fizzlers that were dynamic. Once I changed them to a prop_dynamic_override, they started working fine.
All of my fizzler props are prop_dynamic and all of them are working perfectly.
I don't know about those panels you are using though, but as long as they work for you as prop_dynamic_override...
useful tools and stuff here on TWP [spoiler]
[/spoiler]What flags does your fizzler have? You might fizzle your model if you have the flags on everything 
lol
useful tools and stuff here on TWP [spoiler]
[/spoiler]Were you using fizzler.mdl instead of fizzler_dynamic.mdl? That one is static, since you can't use dynamic props as static ones in any way. It's for cases when it doesn't need to move.
That one is static, since you can't use dynamic props as static ones in any way. It's for cases when it doesn't need to move.and in case you don't need to use open/close animations.