When you re-spawn after dying if you choose the same spawn point and click done the game waits for several minutes before starting the spawn countdown timer of 5-30seconds or whatever it is, or maybe you don't spawn at all I don't really remember.
In order to re-spawn you have to select another spawn location and then you can either spawn there or re-select your original spawn location before clicking done, which triggers the countdown timer immediately. I think everyone else experiences this but I don't remember it ever being mentioned, and I think I thought my installation was broken at first or I needed to use a keystroke or something, it was very frustrating before I fugured out what to do. I personally think this should be listed as one of the essential things you need to know to play the game, right up there with "it's a crysis wars mod, not crysis vanilla", "you have to join a multiplayer server with crysis wars before launching MWLL for the first time" and "press e to enter your mech". I'm not sure this is the right place to post this, it seems to be a glitch everyone just lives with so I didn't want it to report it as one.