Just testing out my game and suddenly gears stopped welding to arms, and they end up getting destroyed. Getting heaps of complaints at the same time this is happening. Tested this on a completely empty game, same behavior. I’m guessing some sort of update to R15 is going on…? 
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Please follow the steps for reporting a bug to ensure we have enough information to fix:
http://devforum.roblox.com/t/steps-to-report-a-bug/24388/8?source_topic_id=31160