It's not anti-debug. The program doesn't have any kind of packer/protection. It's pure C/C++ code.
I believe the problem it's that the process runs as service with the SYSTEM user account; and even when I checked the option to allow the SYSTEM process to communicate with user desktop, Olly 1.10 has some kind of issue when trying to "pop-up" after a BPs has been reached (or when you hit "pause", or any other kind of interaction with it).
EDIT: Olly2 has the same problem too.
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