After upgrading to IJC 5.6 we occasinally get error messages (see snapshot) referring to missing Markush Enumeration Plugin licenses, even when doing a regular substructure search. Have you made any changes to what features are covered by the different plugins?
Yes, we are aware of this issue. It was already fixed and we are going to release version 184.108.40.206 soon. It will contain fix for this problem. Thanks for report and appologies for troubles.
The topic was already discussed here: https://www.chemaxon.com/forum/ftopic8142.html. Just copying last comment from that topic:
problem will be fixed in a patch version of JChem and Instant JChem
very soon. In the meantime we can provide a temporary license to avoid
the problem. If anyone would like such a license please contact:
sales at chemaxon dot com
A 220.127.116.11 patch version of IJC is now available. This fixes this bug in JChem search.
Sorry for any inconveniences.