I've been sitting here trying to troubleshoot the issue for a good two hours now.
I've used uop2mul_2.0 to unpack the UOP files into MUL files and moved them into the base directory of UO. I've gone into my registry and manually added the registry changes suggested in various posts. I've tried rebooting everything including my computer. For some reason I still can't for the life of me get it to mine. It's clearly an issue with the tiles, but EasyUO must not be accessing the MUL files despite the registry pointing it to them, suggestions?
I'm currently trying to use this on a production shard, if that matters.
Edit: Some additional information... I'm currently on Windows 10 64 bit using the most up to date client possible and the most up to date EasyUO client. My ExePath registry entry is set at C:\Ultima Online Classic\client.exe which is the location of my UO client. I've double checked to make certain the MUL files are in the directory and they are. EasyUO's registry entry also has this directory set for the client, so it's clearly detecting it. I'm really not sure what else I can do here.