Hi guys, I'm new in this forum, and I'm not sure if it is still alive, but here it goes anyway:

my problem is very simple: when i turn the AP on, the aircraft holds the trajectory (which is ok); when i turn NAV or HDG on, it follows the path (which is ok); but when i attemp to trim up or down using the pitch control on the AP panel, is doesnt move an inch  :-/...that same control, when turned to the sides, SUCESSFULLY makes the aircarf turn with a given bank, so I assume its not an AP issue.
What can be wrong with the software, or what can i be doing wrong with procedures ?

Thanks in advance for your atention