I have bought UR22 to recording electric guitar,and I need use some VST plugins.But there is a serious problem…The self test always hints “vst system link has been deactived because of too many receive errors”.But I have install the lastest driver.The vst connection is right.All port is active.My os is win7 sp1 64bit.Please help me find out what go wrong and how to fix it.Thx!! 
Hi and welcome,
I think, you don’t need VST System Link at all. System Link for linking and syncing 2 computers with Cubase. I guess, this is not your case.
Open Devices > Device Setup > VST System Link, and disable “Active” and “Online” option here. Set ASIO Input and Output to Not Connected. Now the VST System Link is disabled.