I open one thread and I can post where it says reply for general I guess. I open another thread and the option to reply is grayed out. Why?!
If the reply button is grayed out that means the thread has been locked or you don't have the ability to reply to threads in that board. Based on your description, it sounds like it's the former. This is done intentionally to prevent any additional replies.
If you'd like more detail on why a specific thread was locked then you should reach out to a member of the moderating team:
Ive been having trouble too.
For a minute i thought i was banned...
If you were banned you wouldn't be able to log on.
Technically, you can still login if you're banned. However, you'll always be taken to a screen that informs you that you're banned. On that note, if you're not seeing a screen saying you're banned then you aren't banned.
What sort of trouble have you been having LAST_REAL_GAMER? Is it along the same lines as the original question in this thread? If so, you should try different threads since the ones you are looking at might be locked.