22 February 2018
Okay I found it. Different instances are saying different things. MCMyAdmin is saying its license key is invalid. And StarBound is saying this.
[18:23:11] [Core:System Error] : No application module specified. Please specify one in your AMP configuration file, or re-run the instance manager.
[18:23:11] [Core:System Error] : ERROR building certificate chain: System.Threading.ThreadAbortException
at System.Security.Cryptography.X509Certificates.X509Chain.Build (System.Security.Cryptography.X509Certificates.X509Certificate2 certificate) [0x00006] in <284c8916baa7426e854207bb68427ea7>:0
at Mono.Net.Security.SystemCertificateValidator.BuildX509Chain (System.Security.Cryptography.X509Certificates.X509CertificateCollection certs, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors& errors, System.Int32& status11) [0x00016] in <284c8916baa7426e854207bb68427ea7>:0
[18:23:11] [Core:System Error] : Please, report this problem to the Mono team
I haven't tested with other ones but the only Instances that run are the ADS and just basic Minecraft ones.284c8916baa7426e854207bb68427ea7>284c8916baa7426e854207bb68427ea7>