Guys, my bad for not pointing this out sooner. Did any of you post on this thread?
https://community.usa.canon.com/t5/EOS/Need-some-help-regarding-90D-and-Sigma-150-600C-OS-issue/m-p/...
If so, I suggest that you change your passwords immediately. I had thought I passed this suggestion along earlier, but I see that I did not. I apologize for that. This advice holds true for any other thread with a weird post in it.
If you want to know what exactly was wrong, then DM with a personal message.
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"The right mouse button is your friend."
