Cheat Engine

[irql_not_less_or_equal]

I've been using CheatEngine to find addresses and then writing my own c# program to read values and display them in my own form; I only use ReadProcessMemory() since I'm only interested in reading.
This all worked fine until the game released an update that somehow manages to block my program from reading its memory; in fact, I can't even open a valid handle to it. The most bizarre part is that CheatEngine is unaffected and continues to read stuff like a pro.

My program works like this:
1. Require administrator privileges via application manifest
2. Set SeDebugPrivileges() by using Process.EnterDebugMode()
3. Get a list of processes by using Process.GetProcessesByName()
4. Open a handle to memory via OpenProcess() with PROCESS_WM_READ and the PID from the Process object

The problem I encounter is that OpenProcess() always returns 0, even if I use PROCESS_ALL_ACCESS. Furthermore, I noticed several properties in the Process object returned by GetProcessesByName() give an ACCESS_IS_DENIED error, including "Handle" and "MainModule.BaseAddress", both of which I need for my purposes.
I tried my code on csrss.exe instead, and it worked fine. As such, I'm at a lost as to how to fix my code, but I know it must be possible since CheatEngine is able to do it.

Oh btw, I tested this both on Windows 7 and 8.1, same results.

Here's my sample code:

[Dark Byte]

Is your debugger running as admin ?
Have you confirmed that your process has SeDebugPrivilege (check with process explorer)
And do you have kernelmode openprocess selected in ce or not ?

[irql_not_less_or_equal]

[Dark Byte]

Hmm weird. If the default settings of cheat engine can open it without a problem then not sure. (If it's because of access rights, then ce's default openprocess should have failed as well)