I appear to have the same problem (or close) to what you people are talking about. however, this is the message I get:
[Error] FML appears to be missing any signature data. This is not a good thing.
------
So I'm using a premium account but I also get more messages from the console relating to FML. In standards, i feel that a certain batch file or somehow getting my signature data to be linked to forge from FML would solve this. Although i dont really think a batch file would fix that issue because FML is nothing related to a batch. btw heres a batch below that I did. Its not really an advanced batch.
java -server -Xmn512M -Xms1024M -Xmx1024M -jar forge-1.12.2-14.23.5.2844-universal.jar -0 nogui
pause