I am having the same issue. I had at first one flight after installing into XP11, which went fine without any problems at all. Then, tonight, I decided on doing a bit longer trip (KFAT-KRNO), and from the get-go the hydraulic pump was hyperactive. Not some seconds or minutes and then off, but continous. After turning it off and on again, things were fine for some seconds, or up to a minute or two, then it goes again, with the ever-present humm. This is in addition to some slightly unexpected engine management parameters (with the CTOT engaged). I am using Saitek throttles and while managing the engines during my first flight (in the pattern), the long distance flight was way more erratic, with values in torque and temperature changing in level flight without me commanding it (we're talking for example one engine moving from 80-20% torque with the other remaining at 80, or with both throttling down uncommanded to about 20%, leading to a loss of airspeed. This last bit, I'm not sure if it's a bug or me being a knobhead, but I'm flying it like I did in XP10, and I have not encountered this behaviour before.