As of wine-1.1.30, EasyUO window resizes to a 5x5 (or so) pixels square, making it impossible to even click the 'File' menu.

Here's a way around it (tested on Xfce):

Click the EasyUO slot in the taskbar (to reduce it) and open it again, it is now a 5x5 unusable window.

Now, reduce the window behind it (or open and reduce one) by clicking their slot in the taskbar, then triple-click the EasyUO slot in the taskbar.

EasyUO should now be back to its normal size.