CEx.io API access not working

Describe the problem:
Created new API key/secret, activated it, not working, sync not starting at all.

Which exchange/wallet is this regarding?

How did you import data into this wallet?

What have you tried to fix this so far?
Deleted/recreated API keys/secrets a few times. Tried to activate using both Firefox and Chrome browsers on CEX.io. Not sure if their API is broken, or the client here is.