Hello I am experiencing this same issue. Source control is pointing to a server that does not exist anymore. Have tried uninstalling and re-installing Perforce helix and Unreal 4.10.4.
Crash Report:
MachineId:E2214064497B0A306AEB5287EC0C0969
EpicAccountId:f44ab86377f7471d84dadb16f5ff06ab
Stack overflow - code c00000fd (first/second chance not available)
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plsapp64
plsapp64
ws2_32
ws2_32
UE4Editor_PerforceSourceControl!NetTcpSelector::Select()
UE4Editor_PerforceSourceControl!NetTcpTransport::SendOrReceive()
UE4Editor_PerforceSourceControl!NetBuffer::Receive()
UE4Editor_PerforceSourceControl!RpcTransport::Receive()
UE4Editor_PerforceSourceControl!Rpc::DispatchOne()
UE4Editor_PerforceSourceControl!Rpc::Dispatch()
UE4Editor_PerforceSourceControl!Rpc::Dispatch()
UE4Editor_PerforceSourceControl!Client::WaitTag()
UE4Editor_PerforceSourceControl!Client::RunTag()
UE4Editor_PerforceSourceControl!Client::Run()
UE4Editor_PerforceSourceControl!Client::Init()
UE4Editor_PerforceSourceControl!ClientApi::Init()
UE4Editor_PerforceSourceControl!FPerforceConnection::EstablishConnection()
UE4Editor_PerforceSourceControl!FPerforceConnection::FPerforceConnection()
UE4Editor_PerforceSourceControl!FScopedPerforceConnection::Initialize()
UE4Editor_PerforceSourceControl!FPerforceGetWorkspacesWorker::Execute()
UE4Editor_PerforceSourceControl!FPerforceSourceControlCommand::DoThreadedWork()
UE4Editor_Core!FQueuedThread::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\hal\threadingbase.cpp:400]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]