I recently installed the EAP of SQL Prompt 6 at the recommendation of one of the support folks, V5 had been crashing VS2012 on close - and the EAP 6 version did indeed seem to fix it.
However, now when I am running the EAP 6 version and authoring a query against a database I end up with SSMS entirely locking up. It doesn't crash, it just becomes unresponsive until I end task with the task manager. Looking in the application log I can see this particular error repeated over and over again during the periods when it's locking up with the source of each being SQL Test 1:
#1:Failed to load assembly RedGate.SQLPrompt.CommonUI.resources, Version=18.104.22.168, Culture=en, PublicKeyToken=7f465a1c156d4d57
Or sometimes with a variation on the Culture:
#1:Failed to load assembly RedGate.SQLPrompt.CommonUI.resources, Version=22.214.171.124, Culture=en-US, PublicKeyToken=7f465a1c156d4d57
#4:Failed to load assembly Microsoft.SqlServer.Management.SqlStudio.Explorer.resources, Version=126.96.36.199, Culture=en, PublicKeyToken=89845dcd8080cc91
#10:Failed to load assembly RedGate.SQLTest.Model.resources, Version=188.8.131.52, Culture=en, PublicKeyToken=7f465a1c156d4d57
#1:Failed to load assembly RedGate.SSMSIP.CommonUI.resources, Version=184.108.40.206, Culture=en, PublicKeyToken=7f465a1c156d4d57
Upon terminating SSMS I also see (with a source of SQL Prompt 5, which I no longer have installed):
2013-07-04 15:16:42,767  ERROR SsmsAutomator.SsmsCommandTarget [(null)] - An error occurred while connecting
System.Runtime.Remoting.RemotingException: The remoting application name, 'SsmsAutomator.SsmsRemoteControl', had already been set.
at System.Runtime.Remoting.RemotingConfigHandler.set_ApplicationName(String value)
at System.Runtime.Remoting.RemotingConfiguration.set_ApplicationName(String value)
at SsmsAutomator.SsmsCommandTarget.OnConnection(Object application, ext_ConnectMode connectMode, Object addInInst, Array& custom)
So, while my initial issue of VS2012 crashing on me at close is resolved, SSMS is now crashing on me with normal use of SQL Prompt.