I have been having the same application error with the plant catalogue whch closes the drawing - this seems to happen after I have edited the render/shadow through the dialogue box. At other times I find that the plant symbol I have selected from the catalogue is then not the one which is placed in the drawing. I'm usually only changing the size of the plant with the dialogue box - nothing complex! I'm now using VWv12, with no imported stuff from previous versions, although I used to have the same issue with 11.5.
