Why would scenebuilder 2.0 fail to open my fxml file?

Okay.. so here I am searching for the solution for this weird problem! Seeing none of the other answers working for me, I did the random most thing I could think of and it worked.

Open SceneBuilder (a brand new one). Go to File > Open Recent > Clear Menu. Close Scene Builder.

Now the bug should be fixed (it did for me)

PS: I am ashamed of posting this answer. But since this is a nasty bug which wasted time, I don't want anyone else to waste theirs'.

PPS: Also, I can't double-check this solution, since it worked for me and I can't recreate the buggy scenario anymore.

I had the same problem. looks like it is a bug.

I have solved it by Creating a new FXML file (Empty) and copied all the code of original FXML file to it . The new FXML opened by SceneBuilder.

I solved this problem by alt-tabbing to the SB program, then maximizing the window (shortcut: window key + up arrow key).

Seems to be a SB bug.