I run both RM6 and RM7 under CrossOver, though as my "production" use is still on RM6, I have used that more than RM7 in the last few weeks. However, I have NEVER seen the problem under CrossOver, only under MacBridge, both with RM6 and RM7.
What are you wanting to know about the RM7 installation under CrossOver? I used the unofficial Tie for RM7 - CrossOver officially supports RM3 to RM6, but not RM7 (unless that has changed recently). The only problem I had was in defining the folders for my RM files - for some reason the RM "file manager browse" function just hangs in the latest couple of levels of CrossOver V14, but the way round that is to switch the Virtual machine type from Windows XP to Windows 7, use the browse function to point to the folders, and then switch the virtual machine type back to Windows XP. (This has been accepted by CossOver as a bug with RM6 and they suggested the bypass, which has worked fine for me on both RM6 and RM7.)
I'm currently using Yosemite 10.10.1, though was running Mavericks 10.9.5 until the beginning of December.
Does that help? Please feel free to ask any supplementaries.
I'm trying out CrossOver. I have the same problem not being able to define the folders ..... it hangs. So, my question is ..... how do I change the virtual machine type from Win XP to Windows 7?