Hi
I bought the CS 757 III P3D v4( Base pack and Expansion pack) a few weeks ago. Base pack has now been updated to 1.3.0.3.
It's a great aircraft which I enjoy very much. However, although I engage the Auto Throttle switch during  taxiing, the speed after take off rises way past the 250kts listed on the FMC Legs Page, when the aircraft is climbing to the Transition Alt of 6000'. I have to manually control the speed via my Saitek Throttle Quadrant, as when left without manual input the speed rises to 300kts.

I have tried using F3 on the keyboard to control the throttle just in case there was some conflict with the Saitek quadrant.
I have also re-installed aircraft in an attempt to resolve the issue.

I have other aircraft where the A/T does not cause this problem, and I would be pleased if someone could offer me some advice.
Regards
Andy