I am seeing the same issue with two models I uploaded last night. I was using 1.10.1.50 last night and when try to open direct in Studio, it just fails and says to download first. When I download and try to open, I get the same warning (except without the unrecognized key message).
Got a response for my support ticket asking me to send them the original profile. Another response this morning saying that they had corrected the issue and asking me to upload new profiles and delete the original one. This seems to have corrected the issue.