We've just upgraded to AC14 and have also been experiencing similiar strange behaviour with the BIMServer libraries not loading for all our cad stations. We never had the problem in AC13 BIMserver.
The workaround suggested of putting the various libraries into one folder ant then uploading them to the BIMserver seems to have solved most of the issues, allowing us to at least get on with our work.
Haneef Tayob
Aziz Tayob Architects
AC23 INT rel 3003, OS X 10.14.6 iMac 3.3ghz i5 dual monitor, 24GB RAM