I have been using marvin sketch and tried to use the protonation tool but found that my license key is no longer valid. I have updated my application form.
Is it possible to obtain a new key?
The license key system has not changed so any keys you have added will still be functional. Did you add the license key to Marvin originally? Have there been any environmental changes (new computer, partitioning, file re-arrangement etc). Please do try to add the keys again
If this is not a solution can you ask about this in other sections of the forum, the moderators there will be able to help you better - I suggest this one http://www.chemaxon.com/forum/forum6.html