Some of these are bugs and some features... or bugs :]
* Pressing the "Add Keyframe" on the timeline will crash Spriter in an empty project.
* When you change "Animation Length" to less than 1000, the timeline gets rescaled and then you have to rescale up.
* The selection in the viewport is deselected when you move the slider in the timeline.
* Whenever you change a value, the change is commited directly. Say, you enter size to be 0,2, if you enter 0 the sprite will crash the program (since it can't have a value of zero I would assume). Wait to make the changes until the user deselects the window or alternatively press enter.
* When using scale-constraint (SHIFT) you should be able to press SHIFT after you've started scaling and it will snap back to original "uniform" scale. Instead of just using the new scale ratio to constrain it.
* After undo, all my gizmos are super small.
* You can't use the right click IK anchor or inheritence unless your window is maximized.