Certain hook_node_zyx APIs don't fire

I implemented hook_node_view but somehow this hook never get called. Then I tried some other hook_node_zyx APIs and found out that a few of them can get called (e.g., hook_node_insert) wh开发者_JAVA技巧ile most of them just don't fire. Does anyone have any idea what's the problem here? Thanks!

I researched on the web and there are some people saying 3rd party modules like CTools could cause situation like this, is this true? Here's a list of 3rd party modules I now installed:

• CTools
• Coder
• Devel
• Features
• Organic Groups
• Panels
• Views

i don't think ... but make sure that you cleared the cache after implementing the hook and make sure that u are implementing the hooks correctly its better to show us the code that u wrote....dont forget to replace "hook" with ur module name