I had this problem on my O3DS using Browserhax. I could launch Homebrew once, run Pasta which reboots to home, then freezes on the grey screen when trying to run Homebrew again everytime. However, I was able to overcome this by Initializing SaveData in the broswer after running homebrew to run...
Any clarification on which release of rxTools we should be downloading? You're referencing files and folders that don't exist in the latest version.
I was using the Latest .ZIP but I think I got it from a different link ill update the post soon
The updated link to the RxTools version you used...