So every time I try and access my Mindcrack modpack everything is sweet until I try and access my multiplayer server. This happened after I stopped playing for a couple of days and the recent update. I have looked at literally every thread ever made on this topic and nothing seems to work (including reinstalling java, ftb, etc). I also have optifine running too. Is this a topic that the creators may actually have to have a look at? There seems to be no resolution (or at least that I have found). Here are my logs - http://pastebin.com/nFrY0Hc8
Holy lord almighty, Rendering Entity.
- Thread starter Phlaps_Nomsayin
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Can you try without Optifine, this thread has a similar problem and they were using optifine: http://forum.feed-the-beast.com/threads/7-days-and-36-crash-reports-later.8064/
This has helped, thank you but unfortunately it lags too much and takes me about a minute to get my mouse to the "back to game" button, making it impossible to play. The error has stopped coming up though. Is there any other anti-lag mods available or is it only optifine? :S
I use 1.4.7 because I was told I was supposed to match it up to the minecraft that is used with my FTB? I will try 1.5.2 now 
After I installed it every time I open it the window will go blank :S here are the logs - http://pastebin.com/PF8Q1KU9
Yeah the error came up again so it is obviously optifine but there is no other way to play without it being laggy af
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