The not-replacing-tabs-with-spaces thing is my plugin's fault. I'm not sure why normal tabs aren't showing though...
I should have some time tomorrow, so I'll look into it.
EDIT:
It seems that the removing tabs thing is completely the WYSIWYG editor's fault, as they are removed on the client side.
Tabs that actually reach the server side are displayed correctly.
I would try figuring out what is going on, but SCEditor makes my head hurt.
The last time I tried writing a plugin for it (on a local MyBB install), to add support for our custom tags, it would get completely borked whenever I added... pretty much anything.
I should have some time tomorrow, so I'll look into it.
EDIT:
It seems that the removing tabs thing is completely the WYSIWYG editor's fault, as they are removed on the client side.
Tabs that actually reach the server side are displayed correctly.
I would try figuring out what is going on, but SCEditor makes my head hurt.
The last time I tried writing a plugin for it (on a local MyBB install), to add support for our custom tags, it would get completely borked whenever I added... pretty much anything.