On UNIX platforms, ICS uses the FlexLM license server to manage the floating licenses to BX. When you purchase a new license or an upgrade license, you use commands provided by FlexLM to add these licenses to the database of the license server. This process can be confusing, and we highly recommend that new users carefully read Appendix C: License Manager, before adding attempting to add new or upgrade licenses.

In the situation described, the most likely problem is that you forgot to remove the BX 5 licenses from the FlexLM license server. A BX 6 license key will enable both BX 6 and all prior releases of BX (e.g., BX 5, 4, 3.5.1, etc.) to function in "Full Use Mode". However, when BX 6 checks out a BX 5 key, it rejects it and goes into "Demo Mode". This explains the observed situation where BX 5 works, and BX 6 does not.