Found a bug just now which crashes the server. 1) Make a Tier 1 crafter and power it. 2) put the recipe for the Pneumatticraft Speed Upgrade into it. 3) feed it more items than 1 upgrade needs. 4) Crash the server and lose all items involved. Would help if recipes using buckets with a liquid in em were stackable or something like it.
I will update sevtech soon which might fix this crash. This crash also happened only once so far so it doesn't seem to be a big deal.