Cannot open projects over a LAN in 5.1

With all other engine versions I can open a project from another PC on the network, but 5.1 is coming up with an error: Failed to open descriptor file .uproject.
Is there any way round this? It is valuable to be able to work on another machine whilst one is busy without transfering a project or setting up Perforce.

Same problem, need a solution

Same here, I really need a solution soon.

Any solution found? Cant really find it on google either…