I am using Logistic Pipes 0.8.3.98 and BuildCraft 6.3.4. Whenever I put a gate, tried diamond and iron gates, on a LP pipe and right click to open GUI, I get an error in chat log: "Disabled BCProxy for Mod: BuildCraft|Transport. Cause was an Exception." Then the LPs no longer connect to other pipes until server/game restarted. Tried all different versions of LP 0.8.3 and BC 6.3. Tried using Java version 8u20 and version 8u31. Gates work with BC 6.2 and LP 0.8.2.

Log: http://pastebin.com/XZUERAHx

Maybe too new? I think LP is updated to BC 6.3.2

http://ci.thezorro266.com/view/Logistics%20Pipes/job/LogisticsPipes1.7/changes

Could you try if it depends on the direction you click on the gate. (I thought I fixed that)

I tried using BC 6.3.2-6.3.4 and LP 0.8.3.90-0.8.3.98 in different combinations seeing if any particular build combo was the issue. Happened with all combos. I tried clicking from different angles and with the gate on different sides of the pipe, same thing happens.

Should be fixed.
By the way you don't need to restart the game when an Proxy is disabled trough an exception. There is a command to reenable it. /lp wrapper enable [proxyname] in this case /lp wrapper enable BCProxy