If you double-click a folder in the directory view, i.e. to open a folder, it will mistakenly think you're assigning a matrix/patch to the selected cell. It doesn't actually have a matrix/patch to enter, since you only double-clicked a folder, so it enters a blank cell, deleting whatever was previously held in that cell. With no "undo" function, this can be intensely annoying. The only way one should be able to enter an empty cell (which can be handy!) should be by double-clicking/entering the little "X" for "no matrix" or "no patch".
[EDIT] - Sorry, it's actually matrices that are being deleted/overwritten, not cells.
J.
[EDIT] - Sorry, it's actually matrices that are being deleted/overwritten, not cells.
J.