Is it normally hard to send ARTE from MEW to MEW?
Looked for reasons and found these three...
The most common reasons an ERC-20 token transfer might have failed are:
a) The Token contract is locked (tokens are not transferable yet)
b) The sending From account has an insufficient token balance
c) Or in some cases the Token contract does not emit a Transfer event even though the balance is actually deducted (Not compatible fully ERC-20 Compliant)

haven't done much since Minereum trading days. I've stayed involved though and took an early MNE to ARTE swap option last year. Thumbs up