If it's really the same problem as in 2010 than it has nothing to do with crystals, as those didn't exist back then. It's likely a bug that only appears in under very specific circumstances, so it doesn't happen all that often. As the effects are not exactly gamebreaking it will have a pretty low priority, and may not be really fixed ever (if it's hard to track down). The answer you got basically just means that the problem is listed in their bug tracking system, nothing more, nothing less.
Also mind that a forum post from 2010 stating the same problem doesn't mean that the bug has been properly reported at that time as well.
Mind I'm not trying to defend Turbine here, just putting some realistic expectations on the issue.
Used to play: 85 Champ / Captain / Runekeeper / Guardian, Guild Master of everything but cooking.
Playing now: Hellcat / King Tiger / GW Panther / IS / KV-5 / M4 Sherman and more