You would have to analyze/decompile the minergate binaries and prove that it does something suspicious. It's also probable that some other infection in your system is the culprit. I hope that eventually there is support for Ardor and Ignis from one of the major bitcoin hardware wallet providers. That would solve the theft problem. In the meantime what you can do to protect yourself is run the wallet software on Linux within a virtual environment (Vmware, Virtualbox). Also make sure your wallet passphrase is sufficiently strong and always clear your computer's clipboard if you copy/paste your passphrase. You can google how to do this. Whatever you copy remains in your computer's clipboard until you restart the machine.
Security is always the biggest "Achilles's heel" with crypto. We are in the early stages of the crypto revolution and as always all revolutions are messy and it always leaves a pile of victims behind.
Gotta say what bugs me about Ardor is that there is no way to set up a 2FA for the wallet. That sucks, in particular if you have a lot of coins like that unfortunate fella. In Crypto, you cannot be neurotic enough, and even then you could fall into a trap
There is account control straight in the core: http://nxtwiki.org/wiki/Account_Control
If I set this up for the ARDOR wallet will it allow it to forge?
Sure. Account control has no relation to forging, it's a multisig on blockchain, no 3rd party involved.
Exchanges say the trade of ardor will open till everything ok. When ?