Do I have to migrate my ASP.NET application?

[uwejanza]

In a large Dyalog 12.0 ASP.NET application using APL classes and inheritance I am running into problems that might be related to the dotnet interface. I am hesitating to migrate the application to the next Dyalog version because the server hosts several applications and there is no peaceful coexistence between Dyalog 11.0, 12.0 and 12.1 ASP.NET applications on the same server ("There can be only one") which might lead me to test all of them all over again.

Does the latest version of the Dyalog 12.1 dotnet interface (as of April 11, 2011) contain fixes to problems that are still not fixed in the latest version of the Dyalog 12.0 dotnet interface (as of February 4, 2010), especially regarding ASP.NET?

If so, is it possible to create a version of the 12.0 dotnet interface at the maintenance level of the 12.1 version?