I have a package that reads in settings and saves them at application startup time. ( http://our.umbraco.org/projects/developer-tools/usync)  it is hooked into IApplicationEventHandler OnStarted function. 

One thing is does is loads and saves MediaTypes 

on 4.11.x (including 4.11.5) and 6.0.0 this works. on 6.0.1 it throws the following error

[HttpException (0x80004005): Request is not available in this context]
   System.Web.HttpContext.get_Request() +9718164
   System.Web.HttpContextWrapper.get_Request() +28
   umbraco.BusinessLogic.Cookies.get_HasCookies() +26
   umbraco.BasePages.BasePage.get_umbracoUserContextID() +25
   umbraco.BusinessLogic.User.GetCurrent() +8
   umbraco.cms.businesslogic.media.MediaType.Save() +269

looking at the source the following lines have been added to MediaType.Save

var current = User.GetCurrent()    ;
int userId = current == null ? 0 : current.Id;
ApplicationContext.Current.Services.ContentTypeService.Save(_mediaType, userId);

is this a bug ? or my stupid coding ?