I just tested the the Mouse Wheel, Left Mouse Button, Right Mouse Button on the Altitude Selector Control Knob in the VC, and it worked fine for me. I then tried the (I think default) CTRL+SHIFT+Z then + and - Keys, and they all worked fine for me. Note. Holding any of these buttons for a couple of seconds and suddenly you are increasing/decreasing by the thousands at a rapid rate, but certainly not an out of control speed IMO. Releasing the button used, then pressing it again will revert it to increasing/decreasing by the hundreds.

As always, make sure you have the latest version of the Captain Sim product, plus any updates. Use the link to SimOps for the 1011 Captain II (Start Menu > Captain Sim > SimOps [P3D5] (with the L1011 logo) for getting any updates. Note. I assume yours will show SimOps [P3D5], but I don't appear to have one. I have SimOps [P3D4] for the L1011 but I also have it installed there anyway.

Although I doubt your AV has removed any important files for the 1011 Captain II, it is still worth checking to make sure that it hasn't removed one of the files to the Virus Vault/Chest. If it has, you need to restore it AND add it to the AV Exclusions list.

The AV will look for threats as soon a scan of the drive P3Dv5 is installed on occurs, and if it gets a False Possitive on any Captain Sim file, it will remove the file to the Vault/Chest.

Finally. There is always the possibility that something else installed in P3Dv5 is causing your problem, and if it is, it will be hard to figure out which one it is. I use a vanilla P3Dv5.3 with Hotfix 2, with only Captain Sim aircraft installed. When I fly in P3Dv5, it's only with CS aircraft, and I don't care if the scenery doesn't look perfect!