Hi dkeyser,
Both 5.3.3 and 5.6.2 are on Gen2 licensing - STM has not yet moved to Gen3. Basically what's going on is that 5.6 is considered a new "major" version of the software (for various reasons not worth going into here). Somehow the license tables on our end were incorrectly populated so that when Customer Service was generating 5.3.3 keys, the system was still returning 5.6.2 keys. Anyway, the problem should be getting resolved today. Let me know if it doesn't.