yes, you should upgrade to the latest version of FLAC (v1.2.1)
Did archive fix their issues with that?
Absolutely NOT! I've been struggling with that for awhile now. For anyone that doesn't know what this is all about, 24bit FLACs that are encoded in the latter builds of the FLAC encoder software will not properly derive in the LMA deriver, therefore, these files will not pass through the deriver checks. 16bit files work fine when compiled with version 1.2.1, but 24bit will result in an error message since the deriver will not derive the 24bit files correctly. In addition, your 24bit files will not be available for upload until you delete the files compiled in the later FLAC builds and upload FLACs that are made from earlier builds.
Personally, since I upload alot of my shows to archive, I'd rather avoid version 1.2.1 altogether and stick with version 1.1.2.