This is in LyX 2.0.4 on Windows Vista.
Open a document with a float: Figure or wrap: Figure inset (or table
wrap float). Split the view -- left/right or upper/lower doesn't matter.
In the new view the inset will open or close with a left click (the
cursor turns from the text I-shape to a little hand). In the original
view the cursor remains in the text I-shape and the inset cannot be
opened or closed with a left click. However, a right click, then
left-clicking on Open inset, does still work.
Most of the sizable LyX documents on my computer that contain figures
show this behaviour, but one doesn't. I can't see any obvious difference.
Creating a test document containing only a float: Figure and splitting
the view does *not* produce the problem -- although it does show, by
clicking back and forth irregularly in left and right views on the
inset, that the inset sometimes opens or closes together in both views
and sometimes not.
A related problem with a split view occurs with equations, although
this occurs irregularly and generally seems to require a certain amount
of clicking beforehand. In the new view the cursor can be placed
anywhere in the equation with a left click. In the original view the
cursor sits at the start of the equation and doesn't respond to left
clicks. It can still be moved with the arrow keys.
Closing the split view cures the problems.
Andrew